Melanie Vida <mvida <at> mac.com> writes: : : In R, I'm imported a data frame of 2,321,123 by 4 called "dataF". : I converted the data frame "dataF" to a matrix : : dataM <- as.matrix(dataF) : : Does R have an efficient routine to treat the special elements that : contain "inf" in them. For example, can you separate the rows that have : "inf" elements from the matrix into a separate matrix without iterating : over the entire matrix?
This will eliminate all rows that contain Inf or -Inf. m[apply(is.finite(m), 1, all),] : : Also, does R have an efficient way to sort columns in a matrix? This can be interpreted a number of different ways: See ?order ?sort m[order(m[,1]),] # sorts so that column 1 is sorted and rows stay together apply(m, 2, sort) # sort each column separately ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
