[R] threshold matrix
dwinsemius at comcast.net
Fri Apr 29 19:16:37 CEST 2011
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?
> Best Regards
> --- On Fri, 4/29/11, David Winsemius <dwinsemius at comcast.net> wrote:
>> From: David Winsemius <dwinsemius at comcast.net>
>> Subject: Re: [R] threshold matrix
>> To: "Alaios" <alaios at yahoo.com>
>> Cc: R-help at 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
>>> If the value is below threshold the cell should be
>>> 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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