Mercurial > hg > ishara

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

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Adding reorganised general toolbox, now in several subdirectories.
author samer
date Sat, 12 Jan 2013 19:21:22 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/general/numerical/proddims.m	Sat Jan 12 19:21:22 2013 +0000
@@ -0,0 +1,11 @@
+function A=proddims(A,dims)
+% proddims - Product over multiple dimensions
+%
+% proddims :: 
+%    [Size:[[1,E]]->A] ~'E dimensional array',
+%    Dims:[[K]->1..E]  ~'dims to prod over'
+% -> [Size1->A]        :- Size1=arrset(Size,Dims,1). 
+%
+% Result is same size as input except for summed dimensions
+% which are collapsed to a size of 1.
+for i=dims, A=prod(A,i); end