[R] threshold matrix
dwinsemius at comcast.net
Fri Apr 29 15:57:44 CEST 2011
On Apr 29, 2011, at 9:37 AM, Alaios wrote:
> Dear all,
> I have a quite big matrix which I would like to threshold.
> If the value is below threshold the cell should be zero
> if the value is over threshold the cell should be one
M2 <- M
M2[M < thresh] <- 0
M2[M >= thresh] <- 1
or perhaps simply:
M2 <- as.numeric( M < thresh )
> One really simple way to do that is two have a nested loop and check
> cell by cell.
> The problem is that this seems to be really time consuming and
> What do you suggest me to try out?
David Winsemius, MD
West Hartford, CT
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