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You can simulate a 2 dim array with a one dim array by using an equation to compute the index given the row and column.
Something like: ix = row*nbrcols + col (off the top of my head, I'm sure it...

Use a nested loop for the 2 dim and have a separate index for the one dim

Why are you using a 2 dim array? With a little arithmetic you can use a one dim array almost as easily as a 2 dim array.

Do you want all 16 items in the array to be shuffled as if they were in a single array, or do you want what is in row to be shuffled only within that row or column?
If all elements as in a single...