On Apr 29, 2011, at 10:44 AM, Alaios wrote:
Thanks a lot.
I finally used
M2 <- M
M2[M < thresh] <- 0
M2[M >= thresh] <- 1
as I noticed that this one line
M2 <- as.numeric( M[] < thresh )
vectorizes my matrix.
One more question I have two matrices that only differ slightly.
What will be the easiest way to compare and find the cells that are
not the same?
M[!M==N]
N[!M==N]
Best Regards
Alex
--- On Fri, 4/29/11, David Winsemius <dwinsem...@comcast.net> wrote:
From: David Winsemius <dwinsem...@comcast.net>
Subject: Re: [R] threshold matrix
To: "Alaios" <ala...@yahoo.com>
Cc: R-help@r-project.org
Date: Friday, April 29, 2011, 2:57 PM
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
David Winsemius, MD
West Hartford, CT
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