Mercurial > octave
view scripts/polynomial/polyint.m @ 31207:1c40fc2344f4 stable
quad2d.m: Add BIST test to cset b0e90ca8e679 (bug #62972)
* quad2d.m: Add BIST test for bug #62972.
author | Rik <rik@octave.org> |
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date | Sun, 28 Aug 2022 14:19:43 -0700 |
parents | 796f54d4ddbf |
children | 5d3faba0342e |
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######################################################################## ## ## Copyright (C) 1996-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave is free software: you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation, either version 3 of the License, or ## (at your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {} polyint (@var{p}) ## @deftypefnx {} {} polyint (@var{p}, @var{k}) ## Return the coefficients of the integral of the polynomial whose ## coefficients are represented by the vector @var{p}. ## ## The variable @var{k} is the constant of integration, which by default is ## set to zero. ## @seealso{polyder, polyval} ## @end deftypefn function retval = polyint (p, k) if (nargin < 1) print_usage (); endif if (nargin == 1) k = 0; elseif (! isscalar (k)) error ("polyint: the constant of integration must be a scalar"); endif if (! (isvector (p) || isempty (p))) error ("polyint: argument must be a vector"); endif lp = length (p); if (lp == 0) retval = []; return; endif if (rows (p) > 1) ## Convert to column vector p = p.'; endif retval = [(p ./ [lp:-1:1]), k]; endfunction %!test %! A = [3, 2, 1]; %! assert (polyint (A), polyint (A,0)); %! assert (polyint (A), polyint (A')); %! assert (polyint (A), [1, 1, 1, 0]); %! assert (polyint (A,1), ones (1,4)); %!test %! A = ones (1,8); %! B = [length(A):-1:1]; %! assert (polyint (A), [1./B, 0]); %!error <Invalid call> polyint () %!error polyint (ones (2,2))