[R] more efficient double summation...
kathie
kathryn.lord2000 at gmail.com
Fri Aug 29 06:48:14 CEST 2008
Dear R users...
I made the R-code for this double summation computation
http://www.nabble.com/file/p19213599/doublesum.jpg
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Here is my code..
sum(sapply(1:m, function(k){sum(sapply(1:m,
function(j){x[k]*x[j]*dnorm((mu[j]+mu[k])/sqrt(sig[k]+sig[j]))/sqrt(sig[k]+sig[j])}))}))
-------------------------------------------------
In fact, this is a part of optimization. I think if it is changed more
efficiently, then the running time could be shortened.
How could I change this more efficiently? Any suggestion will be greatly
appreciated.
Kathryn Lord
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