Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / symbolic-1.1.0 / splot.m

diff --git a/octave_packages/symbolic-1.1.0/splot.m b/octave_packages/symbolic-1.1.0/splot.m
new file mode 100644 (file)
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+++ b/octave_packages/symbolic-1.1.0/splot.m
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+## Copyright (C) 2002 Ben Sapp <bsapp@nua.lampf.lanl.gov>
+##
+## This program 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 2 of the License, or
+## (at your option) any later version.
+## 
+## This program 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 this program; If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} splot(@var{f},@var{x},@var{range})
+## Plot a symbolic function f(x) over range.
+## @end deftypefn
+
+function splot(expression,symbol,range)
+  ## we should be a little smarter about this
+  t = linspace(min(range),max(range),400);
+  x = zeros(size(t));
+  j = 1;
+  for i = t
+    x(j) = to_double(subs(expression,symbol,vpa(t(j))));
+    j++;
+  endfor
+
+  plot(t,x);
+endfunction