number of zeros in a matrix -row by row
Dear Dimitris, Thanks very much. I tried dim(M) and get: [1] 5030 2142 which I thought meant that my matrix M is actually a matrix, but I tried str(M) and get: int [1:5030, 1:2142] 2 1 2 0 1 0 2 1 2 -1 ... When I tried rowSums(M == 0) I got: Error in rowSums[M == 0] : object of type 'closure' is not subsettable What am I doing wrong? Thanks so much.
Dimitris Rizopoulos-4 wrote:
if 'M' is your matrix, then try this: rowSums(M == 0) I hope it helps. Best, Dimitris onyourmark wrote:
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.
-- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014
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