Message-ID: <1303281046240-3462228.post@n4.nabble.com>
Date: 2011-04-20T06:30:46Z
From: vincent.deluard
Subject: Saving run time in loop
Hi r users,
I am trying to compute the "moving variance" of a large matrix. I now use a
loop but I am looking for a faster solution. Here is a sample of the code.
Source= matrix(rnorm(400),ncol=100)
variances= matrix(rep(NA,4*100),ncol=100)
for (i in 1:80) {variances[,i]=apply(Source[,i:(i+80)],1,var)}
any idea? Many thanks in advance.
Vincent.
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