Hello, I am not very familiar with R and need help in deleting a few columns in a matrix.
Suppose I have a indicator variable called r and it's defined as r = (0, 0, 1, 1). A matrix D is a 3X4 matrix. If I want a new matrix which contains only the columns of D corresponding to the elements of r that equal to 1. how can i write a loop which creat a new matrix that contains only the last 2 columns of D in this case? thanks ______________________________________________ [email protected] 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.
