[BioC] Subsetting in R
michael watson (IAH-C)
michael.watson at bbsrc.ac.uk
Thu Sep 18 12:22:31 MEST 2003
I don't really understand the subsetting in R.
I have a matrix of normalised M values:
matrix <- maM(norm.data)
I ran a t-test on these using multtest and combined the results into another matrix:
t <= mt.teststat(matrix, class, test="t", nonpara="y")
result = cbind(matrix, t)
So as far as I can tell i now have a matrix, "result", that has my normalised M values as columns with a final column on the end giving a non-parametric t-score for each row.
I now want to subset this matrix so that I have only, say, those rows where t > 4. Anyone have any idea how to do this? I have tried all sorts of combinations of [,] on result and got nowhere. I think I am using the wrong kind of object to do subsetting on :-(
Thanks in advance for any help
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