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

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[-rows1,] The actual

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

tst - apply(my.mat, 2, mean) 1 my.mat[,tst] Will return only columns with mean 1 Jim James W. MacDonald Affymetrix and cDNA Microarray Core University of Michigan Cancer Center 1500 E. Medical Center Drive 7410 CCGC Ann Arbor MI 48109 734-647-5623 [EMAIL PROTECTED] 07/22/03 01:53PM I

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

James MacDonald wrote: tst - apply(my.mat, 2, mean) 1 ... and rowMeans(my.mat) 1 will be faster, but perhaps not working for the requested more complicated query. Uwe Ligges my.mat[,tst] Will return only columns with mean 1 Jim James W. MacDonald Affymetrix and cDNA Microarray Core