Hi R users,
I want to know whether there is a fast method to compute the nonzeroes for
each column of dgCMatrix.
For summation or average I can use colSums or colMeans. To count the
non-zeroes I write a function
colCounts <- function(Mat) {
M1 <- apply(Mat, MARGIN=2, FUN=nnzero)
}
But it seems this is quite slow because the apply function would transform a
dgCMatrix to a matrix.
So I come here to ask if there is anybody know some fast method.
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