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diff general/numerical/safe_exp.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/safe_exp.m	Sat Jan 12 19:21:22 2013 +0000
@@ -0,0 +1,11 @@
+function [y,k]=safe_exp(x,l)
+% safe_exp - high dynamic range exponential
+%
+% safe_exp :: X:[[N,M]] -> [[N,M]], [[1,M]].
+%
+% returns y and k such that exp(X) = y * exp(k) and
+% maximum value in y is 1.
+
+k=max(x,[],1);
+y=exp(x-repmat(k,size(x,1),1));
+