Hello I have a matrix of size rows x cols. I also have a vector of size rows.
The vector contains index values that corresponds to rows in the matrix. I would like to re-arrange/sort the contents of the matrix according to the entries in the vector. Can this be done efficiently in R and possibly in place? Or would it be better to allocate another whole matrix? Simple example: matrix: ffffff aaaaaa zzzzzz bbbbbb vector: 2, 4, 1, 3 "new" matrix: aaaaaa bbbbbb ffffff zzzzzz I suppose I could allocate another matrix and loop through the vector of indecies placing entries into the new matrix. Do I have to worry about deallocating the memory space of the first matrix or will it automagically go away if I assign the new matrix to the old matrix identifier (assuming nothing else is pointing at it)? Thanks, Esmail ______________________________________________ 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.
