Count unique values in an array

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Ana
Ana 2014-3-29
评论： Ana 2014-3-30
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.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-3-29
编辑：Azzi Abdelmalek 2014-3-29
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,:)=[]

更多回答（1 个）

Walter Roberson
Walter Roberson 2014-3-29
hint: how many outputs can unique() have?

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