[R] Counting zeros in a matrix
Leeds, Mark (IED)
Mark.Leeds at morganstanley.com
Tue Nov 28 22:32:21 CET 2006
temp<-apply(A,1,sum(diff(x)) == -1 )
but check it because I haven't tested it and when things are not tested
there
can often be unforeseen problems. Also, may have to declare sum(diff(x))
== -1 as a separate function and then call it.
I'm not sure aobut that.
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Guenther, Cameron
Sent: Tuesday, November 28, 2006 4:20 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Counting zeros in a matrix
Hi All,
If you could help me with this problem I would greatly appreciate it.
Suppose I have a matrix A:
1 1 1 1 0 1 1 1 1
1 1 1 0 1 0 1 0 0
1 0 1 0 0 1 0 0 0
1 1 0 0 0 0 1 0 0
I would like, for each row, to sum the number of times a 0 appears in
front of a 1. So what I would like is to have
Sum
1 1 1 1 0 1 1 1 1 1
1 1 1 0 1 0 1 0 0 2
1 0 1 0 0 1 0 0 0 2
1 1 0 0 0 0 1 0 0 1
I tried writing a function to do this but am getting mixed up in the
[i,j] coding. This is just an example the real matrix is much larger.
Thanks in advance.
Cameron Guenther, Ph.D.
100 8th Ave. SE
St. Petersburg, Fl 33701
727-896-8626 ext. 4305
cameron.guenther at myfwc.com
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