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annotate scripts/miscellaneous/symvar.m @ 20830:b65888ec820e draft default tip gccjit

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dmalcom gcc jit import
author Stefan Mahr <dac922@gmx.de>
date Fri, 27 Feb 2015 16:59:36 +0100
parents 4197fc428c7d
children
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1 ## Copyright (C) 2008-2015 David Bateman
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{vars} =} symvar (@var{str})
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21 ## Identify the symbolic variable names in the string @var{str}.
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22 ##
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23 ## Common constant names such as @code{i}, @code{j}, @code{pi}, @code{Inf} and
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24 ## Octave functions such as @code{sin} or @code{plot} are ignored.
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25 ##
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26 ## Any names identified are returned in a cell array of strings. The array is
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27 ## empty if no variables were found.
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28 ##
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29 ## Example:
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30 ##
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31 ## @example
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32 ## @group
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33 ## symvar ("x^2 + y^2 == 4")
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34 ## @result{} @{
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35 ## [1,1] = x
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36 ## [2,1] = y
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37 ## @}
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38 ## @end group
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39 ## @end example
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40 ## @end deftypefn
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41
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42 function vars = symvar (str)
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43 vars = argnames (inline (str));
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44 ## Correct for auto-generated 'x' variable when no symvar was found.
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45 if (numel (vars) == 1 && strcmp (vars{1}, "x") && ! any (str == "x"))
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46 vars = {};
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47 endif
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48
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49 endfunction
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52 %!assert (symvar ("3*x + 4*y + 5*cos (z)"), {"x"; "y"; "z"})
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53 %!assert (symvar ("sin()^2 + cos()^2 == 1"), {})
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54 %!assert (symvar ("1./x"), {"x"})
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