Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / linear-algebra-2.2.0 / @kronprod / rdivide.m

diff --git a/octave_packages/linear-algebra-2.2.0/@kronprod/rdivide.m b/octave_packages/linear-algebra-2.2.0/@kronprod/rdivide.m
new file mode 100644 (file)
index 0000000..86dceca
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+++ b/octave_packages/linear-algebra-2.2.0/@kronprod/rdivide.m
@@ -0,0 +1,53 @@
+## Copyright (C) 2010  Soren Hauberg
+## 
+## 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 3, 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 file.  If not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} rdivide (@var{a}, @var{b})
+## XXX: Write help text.
+## @end deftypefn
+
+function retval = rdivide (a, b)
+  ## Check input
+  if (nargin < 2)
+    print_usage ();
+  endif
+  
+  if (!ismatrix (a) || !ismatrix (a))
+    error ("rdivide: input arguments must be scalars or matrices");
+  endif
+  
+  if (!size_equal (a, b) || !isscalar (b))
+    error ("times: nonconformant arguments (op1 is %dx%d, op2 is %dx%d)",
+           rows (a), columns (a), rows (b), columns (b));
+  endif
+
+  ## Take action depending on input
+  if (isscalar (a) && isa (b, "kronprod"))
+    retval = kronprod (a ./ b.A, 1 ./ b.B);
+  elseif (isa (a, "kronprod") && isscalar (b))
+    if (numel (a.A) < numel (a.B))
+      retval = kronprod (a.A ./ b, a.B);
+    else
+      retval = kronprod (a.A, a.B ./ b);
+    endif
+  elseif (isa (a, "kronprod") && isa (b, "kronprod"))
+    ## XXX: Can we do something smarter here?
+    retval = full (a) ./ full (b);
+  else
+    ## XXX: We should probably handle sparse cases and all sorts of other
+    ## situations better here
+    retval = full (a) ./ full (b);
+  endif
+endfunction