[R] Matrix manipulation - dropping rows based on a query

monkeychump@hushmail.com
Tue, 22 Jul 2003 17:53:09 -0000

I have a matrix with some very funky data. I want to drop the columns
with a mean > 1 (for instance).
#Example:
my.mat <- matrix(rnorm(100, 0, 3), nrow = 10)

#I know I can get the row means:
apply(my.mat,1, mean)

I think I need to get a vector that has those rows > 1

my.mat[-rows>1,]

The actual querry is much more complicated but this gives an approximation.

Thanks.









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