Mercurial > hg > octave-nkf
annotate scripts/polynomial/polyout.m @ 8684:6d15bc6c4c15
polyout.m: Replace com2str with num2str.
| author | Thomas D. Dean <tomdean@speakeasy.org> |
|---|---|
| date | Thu, 05 Feb 2009 13:42:29 -0500 |
| parents | 81d6ab3ac93c |
| children | 983ac67dc3d4 |
| rev | line source |
|---|---|
| 7017 | 1 ## Copyright (C) 1995, 1998, 2000, 2002, 2004, 2005, 2006, 2007 |
| 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 ## @iftex |
| 24 ## @tex | |
| 25 ## $$ c(x) = c_1 x^n + \ldots + c_n x + c_{n+1} $$ | |
| 26 ## @end tex | |
| 27 ## @end iftex | |
|
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28 ## @ifnottex |
| 3424 | 29 ## @example |
| 30 ## c(x) = c(1) * x^n + ... + c(n) x + c(n+1) | |
| 31 ## @end example | |
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32 ## @end ifnottex |
| 3457 | 33 ## and return it as a string or write it to the screen (if |
| 34 ## @var{nargout} is zero). | |
| 5016 | 35 ## @var{x} defaults to the string @code{"s"}. |
| 3426 | 36 ## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue, |
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37 ## filter, polyderiv, polyinteg} |
| 5642 | 38 ## @end deftypefn |
| 3424 | 39 |
| 40 ## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu> | |
| 41 ## Created: May 1995 | |
| 42 ## Nov 1998: Correctly handles complex coefficients | |
| 3426 | 43 |
| 3424 | 44 function y = polyout (c, x) |
| 45 | |
| 3457 | 46 if (nargin < 1) || (nargin > 2) || (nargout < 0) || (nargout > 1) |
| 6046 | 47 print_usage (); |
| 3424 | 48 endif |
| 49 | |
| 4030 | 50 if (! isvector (c)) |
| 3424 | 51 error("polyout: first argument must be a vector"); |
| 52 endif | |
| 3426 | 53 |
| 3424 | 54 if (nargin == 1) |
| 55 x = "s"; | |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
8517
diff
changeset
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56 elseif (! ischar (x)) |
| 3424 | 57 error("polyout: second argument must be a string"); |
| 58 endif | |
| 59 | |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
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diff
changeset
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60 n = length (c); |
| 3424 | 61 if(n > 0) |
| 62 n1 = n+1; | |
| 63 | |
| 4898 | 64 tmp = coeff (c(1)); |
| 3457 | 65 for ii = 2:n |
| 66 if (real (c(ii)) < 0) | |
| 67 ns = " - "; | |
| 68 c(ii) = -c(ii); | |
| 69 else | |
| 70 ns = " + "; | |
| 71 endif | |
| 3424 | 72 |
| 4898 | 73 tmp = sprintf ("%s*%s^%d%s%s", tmp, x, n1-ii, ns, coeff (c(ii))); |
| 3426 | 74 |
| 3424 | 75 endfor |
| 76 else | |
| 77 tmp = " "; | |
| 78 endif | |
| 79 | |
| 80 if(nargout == 0) | |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
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diff
changeset
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81 disp (tmp) |
| 3424 | 82 else |
| 83 y = tmp; | |
| 84 endif | |
| 85 | |
| 86 endfunction | |
| 4898 | 87 |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
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diff
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88 function str = coeff (c) |
| 4898 | 89 if (imag (c)) |
| 90 if (real (c)) | |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
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diff
changeset
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91 str = sprintf ("(%s)", num2str (c, 5)); |
| 4898 | 92 else |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
8517
diff
changeset
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93 str = num2str (c, 5); |
| 4898 | 94 endif |
| 95 else | |
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8684
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
8517
diff
changeset
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96 str = num2str (c, 5); |
| 4898 | 97 endif |
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polyout.m: Replace com2str with num2str.
Thomas D. Dean <tomdean@speakeasy.org>
parents:
8517
diff
changeset
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98 endfunction |