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I have an array of n elements like [1 2 4 8 16]. I want calculate frequency of all combinations. 1, 2 ,4 ,8, 16, 1+2, 1+4, 1+8, 1+16, 2+4, 2+8, 2+16, 4+8, 4+16, 8+16, 1+2+4, 1+2+8, 1+2+16, 1+2+4+8, 1+2+4+16, 1+2+4+8+16 How can i store output in array

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tushar bhonsle
tushar bhonsle 2019-1-25
评论： tushar bhonsle 2019-1-26
1, 2 ,4 ,8 ,16
1+2, 1+4, 1+8, 1+16,
2+4, 2+8, 2+16,
4+8, 4+16,
8+16,
1+2+4, 1+2+8, 1+2+16,
1+2+4+8, 1+2+4+16,
1+2+4+8+16

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Matt J
Matt J 2019-1-25
编辑：Matt J 2019-1-25
n=numel(yourVector);
mask=dec2bin(0:2^n-1,n)-'0';
mask(1,:)=[];
combs= mask*yourVector(:) ;
result = histcounts( combs , 1:max(combs)+1);
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Stephen23
Stephen23 2019-1-26
编辑：Stephen23 2019-1-26
@tushar bhonsle: if you are using a MATLAB version prior to R2014b, then you will not have histcounts and will need to use histc instead, e.g.:
V = [1,2,4,8,16]
N = numel(V);
M = dec2bin(1:2^N-1)-'0';
C = M*V(:)
Z = histc(C, 1:max(C)+1)
@Matt J: surely it is easier to start from 1 than to delete the first row?

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