Mercurial > hg > octave-nkf
annotate scripts/polynomial/polyout.m @ 10224:f6e0404421f4
point to polyint in @seealso, not polyinteg
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 29 Jan 2010 12:52:32 -0500 |
| parents | f0c3d3fc4903 |
| children | 95c3e38098bf |
| rev | line source |
|---|---|
| 8920 | 1 ## Copyright (C) 1995, 1998, 2000, 2002, 2004, 2005, 2006, 2007, 2008, 2009 |
| 7017 | 2 ## Auburn University. All rights reserved. |
| 3424 | 3 ## |
| 4 ## This file is part of Octave. | |
| 5 ## | |
| 6 ## Octave is free software; you can redistribute it and/or modify it | |
| 7016 | 7 ## under the terms of the GNU General Public License as published by |
| 8 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 9 ## your option) any later version. | |
| 3424 | 10 ## |
| 7016 | 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. | |
| 3424 | 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/>. | |
| 3424 | 19 |
| 20 ## -*- texinfo -*- | |
| 5016 | 21 ## @deftypefn {Function File} {} polyout (@var{c}, @var{x}) |
| 3457 | 22 ## Write formatted polynomial |
| 5016 | 23 ## @tex |
| 24 ## $$ c(x) = c_1 x^n + \ldots + c_n x + c_{n+1} $$ | |
| 25 ## @end tex | |
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26 ## @ifnottex |
| 3424 | 27 ## @example |
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28 ## c(x) = c(1) * x^n + @dots{} + c(n) x + c(n+1) |
| 3424 | 29 ## @end example |
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30 ## @end ifnottex |
| 3457 | 31 ## and return it as a string or write it to the screen (if |
| 32 ## @var{nargout} is zero). | |
| 5016 | 33 ## @var{x} defaults to the string @code{"s"}. |
| 3426 | 34 ## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue, |
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35 ## filter, polyderiv, polyint} |
| 5642 | 36 ## @end deftypefn |
| 3424 | 37 |
| 38 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> | |
| 39 ## Created: May 1995 | |
| 40 ## Nov 1998: Correctly handles complex coefficients | |
| 3426 | 41 |
| 3424 | 42 function y = polyout (c, x) |
| 43 | |
| 3457 | 44 if (nargin < 1) || (nargin > 2) || (nargout < 0) || (nargout > 1) |
| 6046 | 45 print_usage (); |
| 3424 | 46 endif |
| 47 | |
| 4030 | 48 if (! isvector (c)) |
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49 error ("polyout: first argument must be a vector"); |
| 3424 | 50 endif |
| 3426 | 51 |
| 3424 | 52 if (nargin == 1) |
| 53 x = "s"; | |
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54 elseif (! ischar (x)) |
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55 error ("polyout: second argument must be a string"); |
| 3424 | 56 endif |
| 57 | |
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58 n = length (c); |
| 3424 | 59 if(n > 0) |
| 60 n1 = n+1; | |
| 61 | |
| 4898 | 62 tmp = coeff (c(1)); |
| 3457 | 63 for ii = 2:n |
| 64 if (real (c(ii)) < 0) | |
| 65 ns = " - "; | |
| 66 c(ii) = -c(ii); | |
| 67 else | |
| 68 ns = " + "; | |
| 69 endif | |
| 3424 | 70 |
| 4898 | 71 tmp = sprintf ("%s*%s^%d%s%s", tmp, x, n1-ii, ns, coeff (c(ii))); |
| 3426 | 72 |
| 3424 | 73 endfor |
| 74 else | |
| 75 tmp = " "; | |
| 76 endif | |
| 77 | |
| 78 if(nargout == 0) | |
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79 disp (tmp) |
| 3424 | 80 else |
| 81 y = tmp; | |
| 82 endif | |
| 83 | |
| 84 endfunction | |
| 4898 | 85 |
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86 function str = coeff (c) |
| 4898 | 87 if (imag (c)) |
| 88 if (real (c)) | |
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89 str = sprintf ("(%s)", num2str (c, 5)); |
| 4898 | 90 else |
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91 str = num2str (c, 5); |
| 4898 | 92 endif |
| 93 else | |
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94 str = num2str (c, 5); |
| 4898 | 95 endif |
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96 endfunction |