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2010 May 11
3
Improving loop performance
R-users,
I have the following piece of code which I am trying to run on a dataframe (aga2) with about a half million records. While the code works, it is extremely slow. I've read some of the help archives indicating that I should allocate space to the p1 and ags1 vectors, which I have done, but this doesn't seem to improve speed much. Would anyone be able to provide me with advice on how I might be able to speed this up?
p1 <- character(dim(aga2)[1])
ags <- character(dim(aga2)[1])
for (i in 1:dim(aga2)[1])
{
if (aga2$first.exon[i]==TRUE)
{
...