[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

[R] Boosting,bagging and bumping. Questions about R tools and predictions.

I'm interested in further understanding the differences in using many classification trees to improve classification rates. I'm also interested in finding out what I can do in R and which methods will allow prediction. Can anybody point me to a citation or discussion? Specifically, I want to