I'm taking a course that uses matlab, and for one assignment, we need to write a function that, among other things, counts the number of rows and columns in any given numeric matrix. The thing is that we're not allowed to use any built-in functions. No x = size(mat). No length(mat). It all has to be done with loops. I was thinking of writing 2 while loops; one to count the number of columns and one to count the number of rows. The only problem is that I have no idea how to check whether or not a specified row or column exists. I tried the 'exist' function, but that will only tell me if the matrix exists. any help is appreciated.