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origlat
2005 May 05
2
efficient filtering of matrices
...separate matrix.
What I have tried so far is very slow for a large dataset I'm working with.
e.g., I have this piece of code to create a new matrix (newmat) based on my
filtering conditions. Do I need to do this kind of thing where I keep
rbinding?
newmat<-rep(NA,12)
for (i in 1:length(origmat[,1])
{
if ( is.na(origmat[i,10]) | (!is.na(origmat[i,10]) & (origmat[i,2] <=
origmat[i,10]) ) )
newmat<-rbind(newmat, origmat[i,])
}
Thanks,
Steven