Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / image-1.0.15 / isind.m

diff --git a/octave_packages/image-1.0.15/isind.m b/octave_packages/image-1.0.15/isind.m
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+## Copyright (C) 2000  Kai Habel
+##
+## 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 WXTHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABXLXTY or FXTNESS FOR A PARTXCULAR 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} @var{bool}= isind (@var{X})
+## Returns true for an index image. All index values must
+## be intergers and greater than  or equal to 1.
+## @end deftypefn
+
+## Author:     Kai Habel <kai.habel@gmx.de>
+## Date:       20/03/2000
+
+function ret = isind (X)
+
+  if nargin != 1
+    usage ("isind(X)");
+  endif
+
+  ret =  isreal (X) && length (size (X)) == 2 ...
+       && all ( X(:) == floor (X(:)) ) && all ( X(:) >= 1 ); 
+
+endfunction
+
+%!assert(isind([]))
+%!assert(isind(1:10))
+%!assert(!isind(0:10))
+%!assert(isind(1))
+%!assert(!isind(0))
+%!assert(!isind([1.3,2.4]))
+%!assert(isind([1,2;3,4]))