MATLAB: Count unique values in an array

count unique values rows

Hello,
I have the following set of data
I need to count how many times the values in column 3 appear. So, for instance: SABC appears 4 times. BTFG appears 20 times. GCBK appears 7 times and so on.
Afterwards I would want to erase the rows for the variables that appear less than 100 times. Is there an efficient way to do this? I'm new at matlab. Thank you so much in advance.

Best Answer

If M is your cell array Try this,
c3=M(:,3)
[ii,jj,kk]=unique(c3)
f=histc(kk,1:numel(jj)); % Frequencies corresponding to ii
idx=f<100
idx1=ismember(c3,ii(idx))
M(idx1,:)=[]
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