[R] How to copy data from data.frame to matrix

From: Dmitrij Kudriavcev <dimitrij.kudriavcev_at_ntsg.lt>
Date: Fri, 04 Mar 2011 17:08:48 +1100


I'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,

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 missed.


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