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
and
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
ineficient.
What do you suggest me to try out?
--
David Winsemius, MD
West Hartford, CT
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