MATLAB: How to count no of iterations of first digit.

count

I want to count number of times first digit of first column is repeating. If
a = [11 3;
     12 4;
     13 3;
     21 2;
     22 5;
     23 6;
     24 3];
So, I want to get result in form of 1 = 3 and 2 = 4

Best Answer

Assuming that there are always two digits:
>> a = [11 3;
        12 4;
        13 3;
        21 2;
        22 5;
        23 6;
        24 3]
>> tmp = fix(a(:,1)/10);
>> uni = unique(tmp);
>> cnt = histc(tmp,uni)
cnt =
3
4
>> [uni,cnt]
ans =
 1   3
 2   4
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