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annotate scripts/general/interp1.m @ 14363:f3d52523cde1
Use Octave coding conventions in all m-file %!test blocks
* wavread.m, acosd.m, acot.m, acotd.m, acoth.m, acsc.m, acscd.m, acsch.m,
asec.m, asecd.m, asech.m, asind.m, atand.m, cosd.m, cot.m, cotd.m, coth.m,
csc.m, cscd.m, csch.m, sec.m, secd.m, sech.m, sind.m, tand.m, accumarray.m,
accumdim.m, bitcmp.m, bitget.m, bitset.m, blkdiag.m, cart2pol.m, cart2sph.m,
celldisp.m, chop.m, circshift.m, colon.m, common_size.m, cplxpair.m,
cumtrapz.m, curl.m, dblquad.m, deal.m, divergence.m, flipdim.m, fliplr.m,
flipud.m, genvarname.m, gradient.m, idivide.m, int2str.m, interp1.m,
interp1q.m, interp2.m, interp3.m, interpft.m, interpn.m, isa.m, isdir.m,
isequal.m, isequalwithequalnans.m, issquare.m, logspace.m, nargchk.m,
narginchk.m, nargoutchk.m, nextpow2.m, nthargout.m, num2str.m, pol2cart.m,
polyarea.m, postpad.m, prepad.m, profile.m, profshow.m, quadgk.m, quadv.m,
randi.m, rat.m, repmat.m, rot90.m, rotdim.m, shift.m, shiftdim.m, sph2cart.m,
structfun.m, trapz.m, triplequad.m, convhull.m, dsearch.m, dsearchn.m,
griddata3.m, griddatan.m, rectint.m, tsearchn.m, __makeinfo__.m, doc.m,
get_first_help_sentence.m, help.m, type.m, unimplemented.m, which.m, imread.m,
imwrite.m, dlmwrite.m, fileread.m, is_valid_file_id.m, strread.m, textread.m,
textscan.m, commutation_matrix.m, cond.m, condest.m, cross.m,
duplication_matrix.m, expm.m, housh.m, isdefinite.m, ishermitian.m,
issymmetric.m, logm.m, normest.m, null.m, onenormest.m, orth.m, planerot.m,
qzhess.m, rank.m, rref.m, trace.m, vech.m, ans.m, bincoeff.m, bug_report.m,
bzip2.m, comma.m, compare_versions.m, computer.m, edit.m, fileparts.m,
fullfile.m, getfield.m, gzip.m, info.m, inputname.m, isappdata.m, isdeployed.m,
ismac.m, ispc.m, isunix.m, list_primes.m, ls.m, mexext.m, namelengthmax.m,
news.m, orderfields.m, paren.m, recycle.m, rmappdata.m, semicolon.m,
setappdata.m, setfield.m, substruct.m, symvar.m, ver.m, version.m,
warning_ids.m, xor.m, fminbnd.m, fsolve.m, fzero.m, lsqnonneg.m, optimset.m,
pqpnonneg.m, sqp.m, matlabroot.m, __gnuplot_drawnow__.m,
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colstyle.m, comet3.m, contourc.m, figure.m, gca.m, gcbf.m, gcbo.m, gcf.m,
ginput.m, graphics_toolkit.m, gtext.m, hggroup.m, hist.m, hold.m, isfigure.m,
ishghandle.m, ishold.m, isocolors.m, isonormals.m, isosurface.m, isprop.m,
legend.m, line.m, loglog.m, loglogerr.m, meshgrid.m, ndgrid.m, newplot.m,
orient.m, patch.m, plot3.m, plotyy.m, __print_parse_opts__.m, quiver3.m,
refreshdata.m, ribbon.m, semilogx.m, semilogxerr.m, semilogy.m, stem.m,
stem3.m, subplot.m, title.m, uigetfile.m, view.m, whitebg.m, compan.m, conv.m,
deconv.m, mkpp.m, mpoles.m, pchip.m, poly.m, polyaffine.m, polyder.m,
polyfit.m, polygcd.m, polyint.m, polyout.m, polyval.m, polyvalm.m, ppder.m,
ppint.m, ppjumps.m, ppval.m, residue.m, roots.m, spline.m, intersect.m,
ismember.m, powerset.m, setdiff.m, setxor.m, union.m, unique.m,
autoreg_matrix.m, bartlett.m, blackman.m, detrend.m, fftconv.m, fftfilt.m,
fftshift.m, freqz.m, hamming.m, hanning.m, ifftshift.m, sinc.m, sinetone.m,
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pcr.m, spaugment.m, spconvert.m, spdiags.m, speye.m, spfun.m, spones.m,
sprand.m, sprandsym.m, spstats.m, spy.m, svds.m, treelayout.m, bessel.m,
beta.m, betaln.m, factor.m, factorial.m, isprime.m, lcm.m, legendre.m,
nchoosek.m, nthroot.m, perms.m, pow2.m, primes.m, reallog.m, realpow.m,
realsqrt.m, hadamard.m, hankel.m, hilb.m, invhilb.m, magic.m, rosser.m,
vander.m, __finish__.m, center.m, cloglog.m, corr.m, cov.m, gls.m, histc.m,
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median.m, mode.m, moment.m, ols.m, ppplot.m, prctile.m, probit.m, quantile.m,
range.m, ranks.m, run_count.m, runlength.m, skewness.m, spearman.m,
statistics.m, std.m, table.m, var.m, zscore.m, betacdf.m, betainv.m, betapdf.m,
betarnd.m, binocdf.m, binoinv.m, binopdf.m, binornd.m, cauchy_cdf.m,
cauchy_inv.m, cauchy_pdf.m, cauchy_rnd.m, chi2cdf.m, chi2inv.m, chi2pdf.m,
chi2rnd.m, discrete_cdf.m, discrete_inv.m, discrete_pdf.m, discrete_rnd.m,
empirical_cdf.m, empirical_inv.m, empirical_pdf.m, empirical_rnd.m, expcdf.m,
expinv.m, exppdf.m, exprnd.m, fcdf.m, finv.m, fpdf.m, frnd.m, gamcdf.m,
gaminv.m, gampdf.m, gamrnd.m, geocdf.m, geoinv.m, geopdf.m, geornd.m,
hygecdf.m, hygeinv.m, hygepdf.m, hygernd.m, kolmogorov_smirnov_cdf.m,
laplace_cdf.m, laplace_inv.m, laplace_pdf.m, laplace_rnd.m, logistic_cdf.m,
logistic_inv.m, logistic_pdf.m, logistic_rnd.m, logncdf.m, logninv.m,
lognpdf.m, lognrnd.m, nbincdf.m, nbininv.m, nbinpdf.m, nbinrnd.m, normcdf.m,
norminv.m, normpdf.m, normrnd.m, poisscdf.m, poissinv.m, poisspdf.m,
poissrnd.m, stdnormal_cdf.m, stdnormal_inv.m, stdnormal_pdf.m, stdnormal_rnd.m,
tcdf.m, tinv.m, tpdf.m, trnd.m, unidcdf.m, unidinv.m, unidpdf.m, unidrnd.m,
unifcdf.m, unifinv.m, unifpdf.m, unifrnd.m, wblcdf.m, wblinv.m, wblpdf.m,
wblrnd.m, kolmogorov_smirnov_test.m, kruskal_wallis_test.m, base2dec.m,
bin2dec.m, blanks.m, cstrcat.m, deblank.m, dec2base.m, dec2bin.m, dec2hex.m,
findstr.m, hex2dec.m, index.m, isletter.m, mat2str.m, rindex.m, str2num.m,
strcat.m, strjust.m, strmatch.m, strsplit.m, strtok.m, strtrim.m, strtrunc.m,
substr.m, validatestring.m, demo.m, example.m, fail.m, speed.m, addtodate.m,
asctime.m, clock.m, ctime.m, date.m, datenum.m, datetick.m, datevec.m,
eomday.m, etime.m, is_leap_year.m, now.m:
Use Octave coding conventions in all m-file %!test blocks
author | Rik <octave@nomad.inbox5.com> |
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date | Mon, 13 Feb 2012 07:29:44 -0800 |
parents | 7277fe922e99 |
children | 7ce925166af6 |
rev | line source |
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1 ## Copyright (C) 2000-2012 Paul Kienzle |
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2 ## Copyright (C) 2009 VZLU Prague |
5837 | 3 ## |
4 ## This file is part of Octave. | |
5 ## | |
6 ## Octave is free software; you can redistribute it and/or modify it | |
7 ## under the terms of the GNU General Public License as published by | |
7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
9 ## your option) any later version. | |
5837 | 10 ## |
11 ## Octave is distributed in the hope that it will be useful, but | |
12 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 ## General Public License for more details. | |
15 ## | |
16 ## You should have received a copy of the GNU General Public License | |
7016 | 17 ## along with Octave; see the file COPYING. If not, see |
18 ## <http://www.gnu.org/licenses/>. | |
5837 | 19 |
20 ## -*- texinfo -*- | |
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21 ## @deftypefn {Function File} {@var{yi} =} interp1 (@var{x}, @var{y}, @var{xi}) |
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22 ## @deftypefnx {Function File} {@var{yi} =} interp1 (@var{y}, @var{xi}) |
5837 | 23 ## @deftypefnx {Function File} {@var{yi} =} interp1 (@dots{}, @var{method}) |
24 ## @deftypefnx {Function File} {@var{yi} =} interp1 (@dots{}, @var{extrap}) | |
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25 ## @deftypefnx {Function File} {@var{pp} =} interp1 (@dots{}, "pp") |
5837 | 26 ## |
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27 ## One-dimensional interpolation. Interpolate @var{y}, defined at the |
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28 ## points @var{x}, at the points @var{xi}. The sample points @var{x} |
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29 ## must be monotonic. If not specified, @var{x} is taken to be the |
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30 ## indices of @var{y}. If @var{y} is an array, treat the columns |
7001 | 31 ## of @var{y} separately. |
5837 | 32 ## |
33 ## Method is one of: | |
34 ## | |
35 ## @table @asis | |
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36 ## @item "nearest" |
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37 ## Return the nearest neighbor. |
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38 ## |
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39 ## @item "linear" |
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40 ## Linear interpolation from nearest neighbors |
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41 ## |
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42 ## @item "pchip" |
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43 ## Piecewise cubic Hermite interpolating polynomial |
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44 ## |
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45 ## @item "cubic" |
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46 ## Cubic interpolation (same as @code{pchip}) |
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47 ## |
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48 ## @item "spline" |
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49 ## Cubic spline interpolation---smooth first and second derivatives |
5837 | 50 ## throughout the curve |
51 ## @end table | |
52 ## | |
53 ## Appending '*' to the start of the above method forces @code{interp1} | |
54 ## to assume that @var{x} is uniformly spaced, and only @code{@var{x} | |
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55 ## (1)} and @code{@var{x} (2)} are referenced. This is usually faster, |
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56 ## and is never slower. The default method is "linear". |
5837 | 57 ## |
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58 ## If @var{extrap} is the string "extrap", then extrapolate values beyond |
5837 | 59 ## the endpoints. If @var{extrap} is a number, replace values beyond the |
6742 | 60 ## endpoints with that number. If @var{extrap} is missing, assume NA. |
5837 | 61 ## |
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62 ## If the string argument "pp" is specified, then @var{xi} should not be |
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63 ## supplied and @code{interp1} returns the piecewise polynomial that |
5837 | 64 ## can later be used with @code{ppval} to evaluate the interpolation. |
65 ## There is an equivalence, such that @code{ppval (interp1 (@var{x}, | |
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66 ## @var{y}, @var{method}, "pp"), @var{xi}) == interp1 (@var{x}, @var{y}, |
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67 ## @var{xi}, @var{method}, "extrap")}. |
5837 | 68 ## |
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69 ## Duplicate points in @var{x} specify a discontinuous interpolant. There |
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70 ## should be at most 2 consecutive points with the same value. |
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71 ## The discontinuous interpolant is right-continuous if @var{x} is increasing, |
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72 ## left-continuous if it is decreasing. |
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73 ## Discontinuities are (currently) only allowed for "nearest" and "linear" |
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74 ## methods; in all other cases, @var{x} must be strictly monotonic. |
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75 ## |
5837 | 76 ## An example of the use of @code{interp1} is |
77 ## | |
78 ## @example | |
79 ## @group | |
8507 | 80 ## xf = [0:0.05:10]; |
81 ## yf = sin (2*pi*xf/5); | |
82 ## xp = [0:10]; | |
83 ## yp = sin (2*pi*xp/5); | |
84 ## lin = interp1 (xp, yp, xf); | |
85 ## spl = interp1 (xp, yp, xf, "spline"); | |
86 ## cub = interp1 (xp, yp, xf, "cubic"); | |
87 ## near = interp1 (xp, yp, xf, "nearest"); | |
88 ## plot (xf, yf, "r", xf, lin, "g", xf, spl, "b", | |
89 ## xf, cub, "c", xf, near, "m", xp, yp, "r*"); | |
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90 ## legend ("original", "linear", "spline", "cubic", "nearest"); |
5837 | 91 ## @end group |
92 ## @end example | |
93 ## | |
94 ## @seealso{interpft} | |
95 ## @end deftypefn | |
96 | |
5838 | 97 ## Author: Paul Kienzle |
98 ## Date: 2000-03-25 | |
5837 | 99 ## added 'nearest' as suggested by Kai Habel |
100 ## 2000-07-17 Paul Kienzle | |
101 ## added '*' methods and matrix y | |
102 ## check for proper table lengths | |
103 ## 2002-01-23 Paul Kienzle | |
104 ## fixed extrapolation | |
105 | |
5838 | 106 function yi = interp1 (x, y, varargin) |
5837 | 107 |
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108 if (nargin < 2 || nargin > 6) |
5837 | 109 print_usage (); |
110 endif | |
111 | |
112 method = "linear"; | |
6742 | 113 extrap = NA; |
5837 | 114 xi = []; |
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115 ispp = false; |
5837 | 116 firstnumeric = true; |
117 | |
118 if (nargin > 2) | |
5838 | 119 for i = 1:length (varargin) |
5837 | 120 arg = varargin{i}; |
5838 | 121 if (ischar (arg)) |
10549 | 122 arg = tolower (arg); |
123 if (strcmp ("extrap", arg)) | |
124 extrap = "extrap"; | |
125 elseif (strcmp ("pp", arg)) | |
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126 ispp = true; |
10549 | 127 else |
128 method = arg; | |
129 endif | |
5837 | 130 else |
10549 | 131 if (firstnumeric) |
132 xi = arg; | |
133 firstnumeric = false; | |
134 else | |
135 extrap = arg; | |
136 endif | |
5837 | 137 endif |
138 endfor | |
139 endif | |
140 | |
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141 if (isempty (xi) && firstnumeric && ! ispp) |
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142 xi = y; |
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143 y = x; |
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144 x = 1:numel(y); |
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145 endif |
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146 |
5837 | 147 ## reshape matrices for convenience |
148 x = x(:); | |
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149 nx = rows (x); |
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150 szx = size (xi); |
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151 if (isvector (y)) |
5838 | 152 y = y(:); |
5837 | 153 endif |
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154 |
5838 | 155 szy = size (y); |
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156 y = y(:,:); |
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157 [ny, nc] = size (y); |
5837 | 158 xi = xi(:); |
159 | |
160 ## determine sizes | |
161 if (nx < 2 || ny < 2) | |
5838 | 162 error ("interp1: table too short"); |
5837 | 163 endif |
164 | |
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165 ## check whether x is sorted; sort if not. |
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166 if (! issorted (x, "either")) |
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167 [x, p] = sort (x); |
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168 y = y(p,:); |
5837 | 169 endif |
5838 | 170 |
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171 starmethod = method(1) == "*"; |
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172 |
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173 if (starmethod) |
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174 dx = x(2) - x(1); |
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175 else |
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176 jumps = x(1:nx-1) == x(2:nx); |
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177 have_jumps = any (jumps); |
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178 if (have_jumps) |
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179 if (any (strcmp (method, {"nearest", "linear"}))) |
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180 if (any (jumps(1:nx-2) & jumps(2:nx-1))) |
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181 warning ("interp1: extra points in discontinuities"); |
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182 endif |
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183 else |
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184 error ("interp1: discontinuities not supported for method %s", method); |
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185 endif |
5837 | 186 endif |
187 endif | |
188 | |
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189 ## Proceed with interpolating by all methods. |
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190 |
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191 switch (method) |
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192 case "nearest" |
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193 pp = mkpp ([x(1); (x(1:nx-1)+x(2:nx))/2; x(nx)], shiftdim (y, 1), szy(2:end)); |
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194 pp.orient = "first"; |
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195 |
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196 if (ispp) |
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197 yi = pp; |
5837 | 198 else |
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199 yi = ppval (pp, reshape (xi, szx)); |
5837 | 200 endif |
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201 case "*nearest" |
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202 pp = mkpp ([x(1), x(1)+[0.5:(nx-1)]*dx, x(nx)], shiftdim (y, 1), szy(2:end)); |
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203 pp.orient = "first"; |
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204 if (ispp) |
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205 yi = pp; |
5837 | 206 else |
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207 yi = ppval(pp, reshape (xi, szx)); |
5837 | 208 endif |
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209 case "linear" |
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210 dy = diff (y); |
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211 dx = diff (x); |
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212 dx = repmat (dx, [1 size(dy)(2:end)]); |
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213 coefs = [(dy./dx).'(:), y(1:nx-1, :).'(:)]; |
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214 xx = x; |
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215 |
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216 if (have_jumps) |
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217 ## Omit zero-size intervals. |
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218 coefs(jumps, :) = []; |
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219 xx(jumps) = []; |
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220 endif |
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221 |
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222 pp = mkpp (xx, coefs, szy(2:end)); |
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223 pp.orient = "first"; |
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224 |
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225 if (ispp) |
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226 yi = pp; |
5837 | 227 else |
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228 yi = ppval(pp, reshape (xi, szx)); |
5837 | 229 endif |
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230 |
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231 case "*linear" |
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232 dy = diff (y); |
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233 coefs = [(dy/dx).'(:), y(1:nx-1, :).'(:)]; |
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234 pp = mkpp (x, coefs, szy(2:end)); |
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235 pp.orient = "first"; |
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236 |
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237 if (ispp) |
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238 yi = pp; |
5837 | 239 else |
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240 yi = ppval(pp, reshape (xi, szx)); |
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241 endif |
5837 | 242 |
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243 case {"pchip", "*pchip", "cubic", "*cubic"} |
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244 if (nx == 2 || starmethod) |
6374 | 245 x = linspace (x(1), x(nx), ny); |
5837 | 246 endif |
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247 |
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248 if (ispp) |
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249 y = shiftdim (reshape (y, szy), 1); |
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250 yi = pchip (x, y); |
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251 else |
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252 y = shiftdim (y, 1); |
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253 yi = pchip (x, y, reshape (xi, szx)); |
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254 endif |
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255 case {"spline", "*spline"} |
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256 if (nx == 2 || starmethod) |
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257 x = linspace(x(1), x(nx), ny); |
5837 | 258 endif |
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259 |
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260 if (ispp) |
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261 y = shiftdim (reshape (y, szy), 1); |
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262 yi = spline (x, y); |
5837 | 263 else |
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264 y = shiftdim (y, 1); |
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265 yi = spline (x, y, reshape (xi, szx)); |
5837 | 266 endif |
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267 otherwise |
5838 | 268 error ("interp1: invalid method '%s'", method); |
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269 endswitch |
5837 | 270 |
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271 if (! ispp) |
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272 if (! ischar (extrap)) |
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273 ## determine which values are out of range and set them to extrap, |
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274 ## unless extrap == "extrap". |
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275 minx = min (x(1), x(nx)); |
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276 maxx = max (x(1), x(nx)); |
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277 |
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278 outliers = xi < minx | ! (xi <= maxx); # this catches even NaNs |
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279 if (size_equal (outliers, yi)) |
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280 yi(outliers) = extrap; |
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281 yi = reshape (yi, szx); |
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282 elseif (!isvector (yi)) |
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283 if (strcmp (method, "pchip") || strcmp (method, "*pchip") |
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284 ||strcmp (method, "cubic") || strcmp (method, "*cubic") |
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285 ||strcmp (method, "spline") || strcmp (method, "*spline")) |
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286 yi(:, outliers) = extrap; |
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287 yi = shiftdim(yi, 1); |
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288 else |
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289 yi(outliers, :) = extrap; |
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290 endif |
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291 else |
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292 yi(outliers.') = extrap; |
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293 endif |
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294 endif |
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295 else |
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296 yi.orient = "first"; |
5837 | 297 endif |
298 | |
299 endfunction | |
300 | |
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301 |
5837 | 302 %!demo |
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303 %! clf; |
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304 %! xf = 0:0.05:10; yf = sin (2*pi*xf/5); |
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305 %! xp = 0:10; yp = sin (2*pi*xp/5); |
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306 %! lin = interp1 (xp,yp,xf, "linear"); |
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307 %! spl = interp1 (xp,yp,xf, "spline"); |
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308 %! cub = interp1 (xp,yp,xf, "pchip"); |
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309 %! near= interp1 (xp,yp,xf, "nearest"); |
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310 %! plot (xf,yf,"r",xf,near,"g",xf,lin,"b",xf,cub,"c",xf,spl,"m",xp,yp,"r*"); |
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311 %! legend ("original", "nearest", "linear", "pchip", "spline"); |
5837 | 312 %! %-------------------------------------------------------- |
313 %! % confirm that interpolated function matches the original | |
314 | |
315 %!demo | |
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316 %! clf; |
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317 %! xf = 0:0.05:10; yf = sin (2*pi*xf/5); |
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318 %! xp = 0:10; yp = sin (2*pi*xp/5); |
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319 %! lin = interp1 (xp,yp,xf, "*linear"); |
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320 %! spl = interp1 (xp,yp,xf, "*spline"); |
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321 %! cub = interp1 (xp,yp,xf, "*cubic"); |
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322 %! near= interp1 (xp,yp,xf, "*nearest"); |
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323 %! plot (xf,yf,"r",xf,near,"g",xf,lin,"b",xf,cub,"c",xf,spl,"m",xp,yp,"r*"); |
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324 %! legend ("*original", "*nearest", "*linear", "*cubic", "*spline"); |
5837 | 325 %! %-------------------------------------------------------- |
326 %! % confirm that interpolated function matches the original | |
327 | |
6721 | 328 %!demo |
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329 %! clf; |
6721 | 330 %! t = 0 : 0.3 : pi; dt = t(2)-t(1); |
331 %! n = length (t); k = 100; dti = dt*n/k; | |
332 %! ti = t(1) + [0 : k-1]*dti; | |
333 %! y = sin (4*t + 0.3) .* cos (3*t - 0.1); | |
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334 %! ddyc = diff (diff (interp1 (t,y,ti, "cubic")) ./dti)./dti; |
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335 %! ddys = diff (diff (interp1 (t,y,ti, "spline"))./dti)./dti; |
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336 %! ddyp = diff (diff (interp1 (t,y,ti, "pchip")) ./dti)./dti; |
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337 %! plot (ti(2:end-1),ddyc,'g+', ti(2:end-1),ddys,'b*', ti(2:end-1),ddyp,'c^'); |
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338 %! legend ("cubic", "spline", "pchip"); |
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339 %! title ("Second derivative of interpolated 'sin (4*t + 0.3) .* cos (3*t - 0.1)'"); |
6721 | 340 |
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341 %!demo |
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342 %! clf; |
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343 %! xf = 0:0.05:10; yf = sin (2*pi*xf/5) - (xf >= 5); |
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344 %! xp = [0:.5:4.5,4.99,5:.5:10]; yp = sin (2*pi*xp/5) - (xp >= 5); |
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345 %! lin = interp1 (xp,yp,xf, "linear"); |
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346 %! near= interp1 (xp,yp,xf, "nearest"); |
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347 %! plot (xf,yf,"r", xf,near,"g", xf,lin,"b", xp,yp,"r*"); |
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348 %! legend ("original", "nearest", "linear"); |
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349 %! %-------------------------------------------------------- |
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350 %! % confirm that interpolated function matches the original |
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351 |
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352 ##FIXME: add test for n-d arguments here |
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353 |
6374 | 354 ## For each type of interpolated test, confirm that the interpolated |
355 ## value at the knots match the values at the knots. Points away | |
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356 ## from the knots are requested, but only "nearest" and "linear" |
6374 | 357 ## confirm they are the correct values. |
358 | |
5837 | 359 %!shared xp, yp, xi, style |
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360 %! xp = 0:2:10; |
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361 %! yp = sin (2*pi*xp/5); |
6374 | 362 %! xi = [-1, 0, 2.2, 4, 6.6, 10, 11]; |
363 | |
364 ## The following BLOCK/ENDBLOCK section is repeated for each style | |
365 ## nearest, linear, cubic, spline, pchip | |
366 ## The test for ppval of cubic has looser tolerance, but otherwise | |
367 ## the tests are identical. | |
368 ## Note that the block checks style and *style; if you add more tests | |
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369 ## be sure to add them to both sections of each block. One test, |
6374 | 370 ## style vs. *style, occurs only in the first section. |
371 ## There is an ENDBLOCKTEST after the final block | |
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372 |
5837 | 373 %!test style = "nearest"; |
6374 | 374 ## BLOCK |
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375 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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376 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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377 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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378 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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379 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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380 %!assert (isempty (interp1 (xp',yp',[],style))) |
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381 %!assert (isempty (interp1 (xp,yp,[],style))) |
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382 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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383 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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384 %!assert (interp1 (xp,yp,xi,style),... |
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385 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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386 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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387 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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388 %!error interp1 (1,1,1, style) |
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389 %!assert (interp1 (xp,[yp',yp'],xi,style), |
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390 %! interp1 (xp,[yp',yp'],xi,["*",style]),100*eps) |
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391 %!test style = ["*",style]; |
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392 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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393 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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394 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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395 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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396 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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397 %!assert (isempty (interp1 (xp',yp',[],style))) |
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398 %!assert (isempty (interp1 (xp,yp,[],style))) |
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399 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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400 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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401 %!assert (interp1 (xp,yp,xi,style),... |
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402 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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403 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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404 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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405 %!error interp1 (1,1,1, style) |
6374 | 406 ## ENDBLOCK |
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407 |
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408 %!test style = "linear"; |
6374 | 409 ## BLOCK |
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410 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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411 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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412 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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413 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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414 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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415 %!assert (isempty (interp1 (xp',yp',[],style))) |
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416 %!assert (isempty (interp1 (xp,yp,[],style))) |
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417 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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418 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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419 %!assert (interp1 (xp,yp,xi,style),... |
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420 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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421 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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422 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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423 %!error interp1 (1,1,1, style) |
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424 %!assert (interp1 (xp,[yp',yp'],xi,style), |
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425 %! interp1 (xp,[yp',yp'],xi,["*",style]),100*eps) |
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426 %!test style = ['*',style]; |
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427 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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428 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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429 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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430 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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431 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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432 %!assert (isempty (interp1 (xp',yp',[],style))) |
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433 %!assert (isempty (interp1 (xp,yp,[],style))) |
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434 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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435 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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436 %!assert (interp1 (xp,yp,xi,style),... |
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437 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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438 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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439 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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440 %!error interp1 (1,1,1, style) |
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442 |
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443 %!test style = "cubic"; |
6374 | 444 ## BLOCK |
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445 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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446 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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447 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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448 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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449 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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450 %!assert (isempty (interp1 (xp',yp',[],style))) |
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451 %!assert (isempty (interp1 (xp,yp,[],style))) |
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452 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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453 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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454 %!assert (interp1 (xp,yp,xi,style),... |
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455 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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456 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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457 %! interp1 (xp,yp,xi,style,"extrap"),100*eps) |
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458 %!error interp1 (1,1,1, style) |
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459 %!assert (interp1 (xp,[yp',yp'],xi,style), |
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460 %! interp1 (xp,[yp',yp'],xi,["*",style]),100*eps) |
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461 %!test style = ["*",style]; |
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462 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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463 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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464 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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465 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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466 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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467 %!assert (isempty (interp1 (xp',yp',[],style))) |
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468 %!assert (isempty (interp1 (xp,yp,[],style))) |
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469 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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470 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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471 %!assert (interp1 (xp,yp,xi,style),... |
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472 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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473 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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474 %! interp1 (xp,yp,xi,style,"extrap"),100*eps) |
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475 %!error interp1 (1,1,1, style) |
6374 | 476 ## ENDBLOCK |
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477 |
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478 %!test style = "pchip"; |
6374 | 479 ## BLOCK |
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480 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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481 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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482 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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483 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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484 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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485 %!assert (isempty (interp1 (xp',yp',[],style))) |
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486 %!assert (isempty (interp1 (xp,yp,[],style))) |
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487 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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488 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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489 %!assert (interp1 (xp,yp,xi,style),... |
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490 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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491 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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492 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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493 %!error interp1 (1,1,1, style) |
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494 %!assert (interp1 (xp,[yp',yp'],xi,style), |
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495 %! interp1 (xp,[yp',yp'],xi,["*",style]),100*eps) |
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496 %!test style = ["*",style]; |
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497 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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498 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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499 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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500 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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501 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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502 %!assert (isempty (interp1 (xp',yp',[],style))) |
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503 %!assert (isempty (interp1 (xp,yp,[],style))) |
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504 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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505 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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506 %!assert (interp1 (xp,yp,xi,style),... |
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507 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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508 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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509 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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510 %!error interp1 (1,1,1, style) |
6374 | 511 ## ENDBLOCK |
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512 |
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513 %!test style = "spline"; |
6374 | 514 ## BLOCK |
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515 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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516 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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517 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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518 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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519 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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520 %!assert (isempty (interp1 (xp',yp',[],style))) |
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521 %!assert (isempty (interp1 (xp,yp,[],style))) |
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522 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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523 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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524 %!assert (interp1 (xp,yp,xi,style),... |
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525 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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526 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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527 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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528 %!error interp1 (1,1,1, style) |
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529 %!assert (interp1 (xp,[yp',yp'],xi,style), |
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530 %! interp1 (xp,[yp',yp'],xi,["*",style]),100*eps) |
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531 %!test style = ["*",style]; |
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532 %!assert (interp1 (xp, yp, [min(xp)-1, max(xp)+1],style), [NA, NA]) |
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533 %!assert (interp1 (xp,yp,xp,style), yp, 100*eps) |
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534 %!assert (interp1 (xp,yp,xp',style), yp', 100*eps) |
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535 %!assert (interp1 (xp',yp',xp',style), yp', 100*eps) |
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536 %!assert (interp1 (xp',yp',xp,style), yp, 100*eps) |
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537 %!assert (isempty (interp1 (xp',yp',[],style))) |
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538 %!assert (isempty (interp1 (xp,yp,[],style))) |
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539 %!assert (interp1 (xp,[yp',yp'],xi(:),style),... |
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540 %! [interp1(xp,yp,xi(:),style),interp1(xp,yp,xi(:),style)]) |
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541 %!assert (interp1 (xp,yp,xi,style),... |
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542 %! interp1 (fliplr (xp),fliplr (yp),xi,style),100*eps) |
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543 %!assert (ppval (interp1 (xp,yp,style,"pp"),xi), |
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544 %! interp1 (xp,yp,xi,style,"extrap"),10*eps) |
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545 %!error interp1 (1,1,1, style) |
6374 | 546 ## ENDBLOCK |
547 ## ENDBLOCKTEST | |
5837 | 548 |
549 %!# test linear extrapolation | |
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550 %!assert (interp1 ([1:5],[3:2:11],[0,6],"linear","extrap"), [1, 13], eps) |
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551 %!assert (interp1 (xp, yp, [-1, max(xp)+1],"linear",5), [5, 5]) |
5837 | 552 |
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553 %!assert (interp1 (1:2,1:2,1.4,"nearest"), 1) |
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554 %!assert (interp1 (1:2,1:2,1.4,"linear"), 1.4) |
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555 %!assert (interp1 (1:4,1:4,1.4,"cubic"), 1.4) |
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556 %!assert (interp1 (1:2,1:2,1.1, "spline"), 1.1) |
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557 %!assert (interp1 (1:3,1:3,1.4,"spline"), 1.4) |
5837 | 558 |
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559 %!assert (interp1 (1:2:4,1:2:4,1.4,"*nearest"), 1) |
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560 %!assert (interp1 (1:2:4,1:2:4,[0,1,1.4,3,4],"*linear"), [NA,1,1.4,3,NA]) |
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561 %!assert (interp1 (1:2:8,1:2:8,1.4,"*cubic"), 1.4) |
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562 %!assert (interp1 (1:2,1:2,1.3, "*spline"), 1.3) |
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563 %!assert (interp1 (1:2:6,1:2:6,1.4,"*spline"), 1.4) |
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parents:
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564 |
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565 %!assert (interp1 ([3,2,1],[3,2,2],2.5), 2.5) |
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Jaroslav Hajek <highegg@gmail.com>
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566 |
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567 %!assert (interp1 ([1,2,2,3,4],[0,1,4,2,1],[-1,1.5,2,2.5,3.5], "linear", "extrap"), [-2,0.5,4,3,1.5]) |
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568 %!assert (interp1 ([4,4,3,2,0],[0,1,4,2,1],[1.5,4,4.5], "linear"), [1.75,1,NA]) |
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569 %!assert (interp1 (0:4, 2.5), 1.5) |
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570 |
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571 %!error interp1 () |
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572 %!error interp1 (1,1,1, "linear") |
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573 %!error interp1 (1,1,1, "*nearest") |
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574 %!error interp1 (1,1,1, "*linear") |
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575 %!error interp1 (1:2,1:2,1, "bogus") |
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576 |