search for: rowcropping

...segments by rows. I want to be able to return each segment as a newly named object. I've tried looking at the apply functions and creating a for loop but brain no work. Here's the basic starting objects that I believe would be needed to separate the matrix. mat <- matrix(c(1:40),10,4) rowcropping <- sort(sample(2:9,2)) rowcropping <- c(1,rowcropping,length(mat[,1])) mat[rowcropping[1]:rowcropping[2],] I want something like the last line as the first object but getting them all by automation as separate objects is my goal. Thanks. [[alternative HTML version deleted]]