Re: [R] Newbie needs to count elements in a row

Try this: rowSums(!is.na(x)) On Tue, Dec 29, 2009 at 11:49 AM, Verena Weber verenawe...@gmx.de wrote: Hi, I have a n*m matrix and would like to count the number of elements not equal to NA in a ROW. e.g. x 1 2 3 NA 10 y 2 NA 8 9 NA Which function can I use to obtain 4 for row x and

Re: [R] Newbie needs to count elements in a row

For a single row where mat is your matrix and r is the row sum(!is.na(mat[r,])) For every row in the matrix rowSums(!is.na(mat)) -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Verena Weber Sent: Tuesday, December 29, 2009

Re: [R] Newbie needs to count elements in a row

Could you just transpose the matrix? Otherwise you can write a simple function that should work. Try this -(mat1 - matrix(c(1, 2, 3, NA, 10, 2, NA, 8, 9, NA),nrow=2)) gl - function(x)length(x[!is.na(x)] apply(mat1, 1, gl)