number of zeros in a matrix -row by row
M <- matrix(0:15, 8, 4, byrow=TRUE) rowSums(M == 0)
[1] 1 0 0 0 1 0 0 0 Bill Venables http://www.cmis.csiro.au/bill.venables/ -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of onyourmark Sent: Sunday, 5 April 2009 10:00 PM To: r-help at r-project.org Subject: [R] number of zeros in a matrix -row by row Hi. I have an n x m matrix M some of who's entries are zeros. I want to know how many zeros there are in each row -perhaps stored in a 1 x n vector which lists the number of zeros for each row of M. Before I had a vector V and I was able to get the number of zeros in V by doing length(V[ V==0]) but when I try something similar for M, like M[ M==0] it creates a vector not a matrix and so this does not work. Does anyone have a solution to this? Thank you.
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