Matrix with numeric values
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I have assigned letters A through Z a numeric value of 1 through 26, respectively. I have been able to form a 26x19 matrix with these random numeric values. However, I do not know how to convert the entire matrix back to character form.
For example, if part of my matrix is [1 2 3 4], I want it to be [A B C D]. (Note: as said above, I have assigned variable A to equal 1, variable B to equal 2, etc.)