Mercurial > octave-nkf
view scripts/miscellaneous/symvar.m @ 20596:87b557ee8e5d
clean up and vectorize code for dense output in ode45
* scripts/ode/private/ode_rk_interpolate.m: new file
* scripts/ode/private/ode_rk_interpolate.m(hermite_quartic_interpolation):
move to internal function, use vectorization and broadcasting.
* scripts/ode/private/hermite_quartic_interpolation.m: remove file
* scripts/ode/module.mk: list added and removed files
* scripts/ode/private/integrate_adaptive.m: use new interpolation code.
author | Carlo de Falco <carlo.defalco@polimi.it> |
---|---|
date | Tue, 06 Oct 2015 19:28:59 +0200 |
parents | 4197fc428c7d |
children |
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## Copyright (C) 2008-2015 David Bateman ## ## 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 ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{vars} =} symvar (@var{str}) ## Identify the symbolic variable names in the string @var{str}. ## ## Common constant names such as @code{i}, @code{j}, @code{pi}, @code{Inf} and ## Octave functions such as @code{sin} or @code{plot} are ignored. ## ## Any names identified are returned in a cell array of strings. The array is ## empty if no variables were found. ## ## Example: ## ## @example ## @group ## symvar ("x^2 + y^2 == 4") ## @result{} @{ ## [1,1] = x ## [2,1] = y ## @} ## @end group ## @end example ## @end deftypefn function vars = symvar (str) vars = argnames (inline (str)); ## Correct for auto-generated 'x' variable when no symvar was found. if (numel (vars) == 1 && strcmp (vars{1}, "x") && ! any (str == "x")) vars = {}; endif endfunction %!assert (symvar ("3*x + 4*y + 5*cos (z)"), {"x"; "y"; "z"}) %!assert (symvar ("sin()^2 + cos()^2 == 1"), {}) %!assert (symvar ("1./x"), {"x"})