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2011 Mar 04
2
How to copy data from data.frame to matrix
...'m a new in R
I have a large data.frame "s" (this is actualy just a table in mysql) :
> names(s)
[1] "symbols", "day", "value"
I need to convert it to simple matrix. I have define this matrix like this:
> data.matrix <- matrix(nrow=nDays, ncol=nSymbols, dimnames=list(days,
symbols))
then i just copy values to the matrix using for() loop, but it seems to take
very long time. Is is a more fast way to do it in R? I know, what i can just
gyve s$value as source data to the matrix, but problem is, what for some
symbols couple days could be just misse...