Hi, Try: ?rowMeans rowMeans(mat,na.rm=TRUE) A.K.
On Sunday, December 1, 2013 1:15 PM, Amie Hunter <amie_hun...@hotmail.com> wrote: Hello R users, I'm new to R so apologies if this question seems simple. I have a matrix which is 35000 columns by 35000 rows and I’m wanting to work out the mean of each row. I've tried using the code below on a smaller version of the matrix, but receive an error: > mat [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [1,] NA 0.3904762 0.2 0.4285714 0.04761905 NA NA NA NA NA NA [2,] NA NA 0.2 0.2000000 0.23809524 0.2190476 NA NA NA NA NA [3,] NA NA NA 0.5047619 0.27619048 0.2952381 0.1428571 NA NA NA NA [4,] NA NA NA NA 0.42857143 0.3714286 0.3333333 0.2190476 NA NA NA [5,] NA NA NA NA NA 0.8666667 0.6761905 0.4857143 0.6571429 NA NA [6,] NA NA NA NA NA NA 0.6190476 0.4285714 0.6761905 0.4857143 NA [7,] NA NA NA NA NA NA NA 0.6952381 0.6380952 0.6000000 0.2571429 [8,] NA NA NA NA NA NA NA NA 0.6761905 0.6000000 0.1809524 [9,] NA NA NA NA NA NA NA NA NA 0.6190476 0.3142857 [10,] NA NA NA NA NA NA NA NA NA NA 0.5809524 [11,] NA NA NA NA NA NA NA NA NA NA NA > mean.matrix <- matrix(ncol=1, nrow=10) > for (i in mat) + mean.matrix[,i] <- apply(mat,1,mean) Error: NAs are not allowed in subscripted assignments I have come across the na.omit() function however this completely removes the row. Is there any way I can either remove all the NAs from the matrix or pull out the values of each row to work out the mean? Thanks, Amie ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
