Hi,
Let's say your data.frame is called df:
df <- data.frame(a=rnorm(10), b=rnorm(10))
data.matrix <- as.matrix(df)
This should work, but be careful with coercion if you have different
modes in your data.frame
HTH,
Ivan
PS: next time, provide a reproducible example, using dput() for example
Le 3/4/2011 07:08, Dmitrij Kudriavcev a écrit :
Hello
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,
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 missed.
Cheers,
Dima
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