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find the number of elements in matrix

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alireza bakhshaee
alireza bakhshaee 2018-4-11
回答： Razvan Carbunescu 2018-4-11
I have a table which contains 6 columns. In the 6th column, I have 3 types data: A , Ae , M I want to find: how many A, how many Ae and how many M I have in this column.
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James Tursa
James Tursa 2018-4-11
Please provide a small sample of your table so we can see exactly what is in that 6th column.

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回答（2 个）

Guillaume
Guillaume 2018-4-11
Should work regardless of the type of data in the 6th column:
[id, group] = findgroups(yourtable.nameof6column)
count = accumarray(id, 1);
%for pretty display
result = table(group, count)
Razvan Carbunescu
Razvan Carbunescu 2018-4-11
If using R2018a can use groupsummary with the first syntax:
GT = groupsummary(T,6)

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