Hi i have a 60x2 matrix, with the first column being a number from 1 to 300 (not consecutive), and the second column with locations from 1 to 9. I have attached a picture to show how it looks like and would like to regroup into a new matrix (AB) of 9x____, the rows being the locations (1:9), and the columns being the numbers that have the respective locations i.e. in the first column, if numbers 8, 16 & 52 have a corresponding location 1 in column 2, AB row 1 will be 8,16,52 (1 in each column, total 3 columns). What functions should I use for this/any ideas how to write for this?
Thank you! :)