
Hello,
I would like to know how to count the number (cardinality) of a specific element in a single row of a matrix.  At this time I have 30X3 matrix.  The first column is the treatment number for each data point.  I would like to know how many of each treatments are in this matrix.  i.e.  I want to know how many 1's are in column 1, how many 2's are in column 1, etc.  I found a couple references to the length function, but I could not make any of them work.
Thanks,
Donna
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