how to find the second most repeated value in vector

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mary m
mary m 2017-8-25
评论： Ambati Sathvik 2020-7-2
how to find the second most repeated value in vector x=[1 2 2 3 5 5 5] i use (mode ) to find the most repeated and frequency [m,f]=mode(x) m=5 the number repeated f=3 the freq.
now,i want to find the second repeated, can help me please

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采纳的回答

Stephen23
Stephen23 2017-8-25
编辑：Stephen23 2017-8-25
>> [n,bin] = hist(x,unique(x));
>> [~,idx] = sort(-n);
>> n(idx) % count instances
ans =
3 2 1 1
>> bin(idx) % corresponding values
ans =
5 2 1 3
>>

更多回答（4 个）

Walter Roberson
Walter Roberson 2017-8-25
Delete all the copies of m out of x and take the mode again.
  1 个评论
Apoorva Srivastava
Apoorva Srivastava 2019-6-16
编辑：Apoorva Srivastava 2019-6-16
% For a vector x:
mode(x(find(x ~= mode(x))))
% In general, if x is a matrix (valid from R2018b onwards)
mode(x(find(x ~= mode(x, 'all'))), 'all')

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Andrei Bobrov
Andrei Bobrov 2017-8-25
[g,v] = findgroups(x);
ii = accumarray(g(:),1);
jj = find(ii > 1);
out = [v(jj(2)), ii(jj(2))]
alexander Mcghee
alexander Mcghee 2019-9-17
X = [1 1 1 1 1 5 5 5] ;
m = mode(X) % -> m=1
X(X==m) = NaN ;
m = mode(X) % -> m=5
mary m
mary m 2017-8-26
thank you for all.. ^_^

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