Assigning alphabets to a range of numbers.

I have an array of random numbers. I want to assign alphabets to a range of numbers. For example 0-20 should be assigned letter A and so on. Kindly help me how to do this.

[KSSV]

Wont A = 1 ; B = 2 ; C = 3 ;....work?

Answer 1

[Walter Roberson]

mask = A >= 0 & A <= 20;
result(mask)  = 'A' ;

Answer 2

[Guillaume]

Your question is really not clear. Possibly:

v = randi([0 20*26-1], 1, 20) %vector of random number
bins = 0:20:20*26;  %[0-19] is A, [20-39] is B, etc. the bins don't have to be uniform but they have to be continuous
out = char(discretize(v, bins) + 'A' - 1)

[Daniyal Ali]

Kindly see the picture for Clarification. Thanks.

[Walter Roberson]

letter(i) = 'A';

You cannot store letters and numeric values in the same numeric (or character) array.