MATLAB: How to find repetition of each unique array in matrix

arraycell arraysfindmatrixunique

Suppose I have a matrix a:
a = [100680
114678
114678
31678
31678
31678
31678
19505
19505
19505
63694
114354
114354
97157
122910
122910
92417
92417
76298];
I want to find the repetition of each unique array. For example:
100680  1
114678  2
31678  4
19505  3
63694  1
114354  2
97157  1
122910  2
92417  2
76298  1

Best Answer

The easiest way is to use the hist function (with help from unique):
xbins = unique(a);
[counts,centres] = hist(a,xbins);
R = [centres counts']
produces:
R =
         19505           3
         31678           4
         63694           1
         76298           1
         92417           2
         97157           1
        100680           1
        114354           2
        114678           2
        122910           2
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