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

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

[Matt J]

What do you mean by "frequency"? They all have unique values.

[tushar bhonsle]

yes i know, but how to calculate and store in an array thrugh programming.

Answer 1

[Matt J]

n=numel(yourVector);

mask=dec2bin(0:2^n-1,n)-'0';
   mask(1,:)=[];
   
 combs=  mask*yourVector(:) ;
 
 result = histcounts( combs  ,  1:max(combs)+1); 

[Stephen23]

+1 very neat.

[tushar bhonsle]

??? Undefined function or method 'histcounts' for input arguments of type 'double'.

error showing.

[Stephen23]

@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?

[tushar bhonsle]

Thanks, It's working but still how can i store in array and write output in excel file.