Mercurial > hg > octave-lyh
annotate doc/interpreter/interpimages.m @ 17489:0ad2f93fd83c
doc: Fix a typo in findobj docstring.
* scripts/plot/findobj.m: Use '3' instead of 'D' in findobj example of depth 3.
| author | Rik <rik@octave.org> |
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| date | Wed, 25 Sep 2013 08:13:30 -0700 |
| parents | 333243133364 |
| children |
| rev | line source |
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maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2007-2012 David Bateman |
| 7018 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 6721 | 19 function interpimages (nm, typ) |
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20 graphics_toolkit ("gnuplot"); |
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21 set_print_size (); |
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22 hide_output (); |
| 7257 | 23 if (strcmp (typ, "png")) |
| 24 set (0, "defaulttextfontname", "*"); | |
| 25 endif | |
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26 if (strcmp (typ, "eps")) |
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27 d_typ = "-depsc2"; |
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28 else |
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29 d_typ = ["-d", typ]; |
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30 endif |
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31 |
| 7262 | 32 if (strcmp (typ, "txt")) |
| 33 image_as_txt (nm); | |
| 34 elseif (strcmp (nm, "interpft")) | |
| 6721 | 35 t = 0 : 0.3 : pi; dt = t(2)-t(1); |
| 36 n = length (t); k = 100; | |
| 37 ti = t(1) + [0 : k-1]*dt*n/k; | |
| 38 y = sin (4*t + 0.3) .* cos (3*t - 0.1); | |
| 39 yp = sin (4*ti + 0.3) .* cos (3*ti - 0.1); | |
| 40 plot (ti, yp, 'g', ti, interp1(t, y, ti, 'spline'), 'b', ... | |
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41 ti, interpft (y, k), 'c', t, y, 'r+'); |
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42 legend ('sin(4t+0.3)cos(3t-0.1)','spline','interpft','data'); |
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43 print ([nm "." typ], d_typ); |
| 6721 | 44 elseif (strcmp (nm, "interpn")) |
| 45 x = y = z = -1:1; | |
| 46 f = @(x,y,z) x.^2 - y - z.^2; | |
| 47 [xx, yy, zz] = meshgrid (x, y, z); | |
| 48 v = f (xx,yy,zz); | |
| 49 xi = yi = zi = -1:0.1:1; | |
| 50 [xxi, yyi, zzi] = ndgrid (xi, yi, zi); | |
| 51 vi = interpn(x, y, z, v, xxi, yyi, zzi, 'spline'); | |
| 6723 | 52 mesh (zi, yi, squeeze (vi(1,:,:))); |
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53 print ([nm "." typ], d_typ); |
| 6743 | 54 elseif (strcmp (nm, "interpderiv1")) |
| 55 t = -2:2; | |
| 56 dt = 1; | |
| 57 ti =-2:0.025:2; | |
| 58 dti = 0.025; | |
| 59 y = sign(t); | |
| 60 ys = interp1(t,y,ti,'spline'); | |
| 61 yp = interp1(t,y,ti,'pchip'); | |
| 62 plot (ti, ys,'r-', ti, yp,'g-'); | |
| 63 legend('spline','pchip', 4); | |
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64 print ([nm "." typ], d_typ); |
| 6743 | 65 elseif (strcmp (nm, "interpderiv2")) |
| 66 t = -2:2; | |
| 67 dt = 1; | |
| 68 ti =-2:0.025:2; | |
| 69 dti = 0.025; | |
| 70 y = sign(t); | |
| 6721 | 71 ddys = diff(diff(interp1(t,y,ti,'spline'))./dti)./dti; |
| 72 ddyp = diff(diff(interp1(t,y,ti,'pchip'))./dti)./dti; | |
| 6743 | 73 plot (ti(2:end-1),ddys,'r*', ti(2:end-1),ddyp,'g+'); |
| 74 legend('spline','pchip'); | |
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75 print ([nm "." typ], d_typ); |
| 6721 | 76 endif |
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77 hide_output (); |
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78 endfunction |
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79 |
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80 function set_print_size () |
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81 image_size = [5.0, 3.5]; # in inches, 16:9 format |
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82 border = 0; # For postscript use 50/72 |
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83 set (0, "defaultfigurepapertype", "<custom>"); |
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84 set (0, "defaultfigurepaperorientation", "landscape"); |
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85 set (0, "defaultfigurepapersize", image_size + 2*border); |
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Rik <rdrider0-list@yahoo.com>
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86 set (0, "defaultfigurepaperposition", [border, border, image_size]); |
| 6721 | 87 endfunction |
| 88 | |
| 89 ## Use this function before plotting commands and after every call to | |
| 90 ## print since print() resets output to stdout (unfortunately, gnpulot | |
| 91 ## can't pop output as it can the terminal type). | |
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Rik <rdrider0-list@yahoo.com>
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92 function hide_output () |
| 6721 | 93 f = figure (1); |
| 94 set (f, "visible", "off"); | |
| 95 endfunction | |
| 7262 | 96 |
| 97 ## generate something for the texinfo @image command to process | |
| 98 function image_as_txt(nm) | |
| 99 fid = fopen (sprintf ("%s.txt", nm), "wt"); | |
| 100 fputs (fid, "\n"); | |
| 101 fputs (fid, "+---------------------------------+\n"); | |
| 102 fputs (fid, "| Image unavailable in text mode. |\n"); | |
| 103 fputs (fid, "+---------------------------------+\n"); | |
| 104 fclose (fid); | |
| 105 endfunction |