diff general/numerical/arrshift.m @ 4:e44f49929e56

Adding reorganised general toolbox, now in several subdirectories.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/general/numerical/arrshift.m	Sat Jan 12 19:21:22 2013 +0000
@@ -0,0 +1,24 @@
+function Y=arrshift(O,X)
+% arrshift - columnwise or rowwise subtraction for arrays
+%
+% This SUBTRACTS the first argument (a vector) from each
+% of the vectors (row or column) in the second argument.
+% Works in two modes: row vector or column vector mode.
+%
+% arrshift :: 
+%    [Size] ~'values to subtract', 
+%    [[N,M]] ~'array of vectors, array domain is M'
+% -> [[N,M]] ~'vectors relative to new origin'.
+%
+% The first argument is REPMATed up to the size of
+% the second and then subtracted.
+%
+% NB: this used to be called vecshift. vecshift is now
+% specialised to subtract a COLUMN vector from an array
+% the same size in the first dimension. This version
+% retains the generality of the original vecshift.
+
+% note: this now works for any pair of arrays where size O
+% is an integer fraction of size X in any dimension
+Y=X-repmat_to(O,size(X));
+