Hallo everyone! I have a problem about creating a matrix... Suppose we have a vector y<-c(1,1,1,3,2)
and a zero matrix, m ,with nrows=length(y) and ncol=4. The matrix would look like this: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I want to change the first three rows with the vector c(1,2,3,4). I thought that with the command m[y==1,1:4]<-c(1,2,3,4) i would get 1 2 3 4 1 2 3 4 1 2 3 4 0 0 0 0 0 0 0 0 but instead i am getting 1 4 3 2 2 1 4 3 3 2 1 4 0 0 0 0 0 0 0 0 It seems it is filling the data by col instead by row. I want to use this technique in more complicated problems. So i do not want to have to work with the transpose matrix. Do you know another way to make this work. Thank you... ______________________________________________ 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.
