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matlabmatrixcombinations
Eugene
Eugene

Reputation: 11270

How to resolve this formula in Matlab ( sum of combinations)

How to resolve this simple formula in Matlab?

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This is sum of combinations. There is function nchoosek to get number of combinations (n,k).

nchoosek(k+m, i) will find this for an i. But how to find for all ranges of i?

So, the only way to resolve this, is to write loop? Or I can do it inline - with matlab functions?

Upvotes: 0

Views: 783

Answers (1)

PengOne
PengOne

Reputation: 48398

If the sum goes from 0 to m+k, then the answer is 2^(m+k), no iteration required. If the sum is from 1 to m+k, then the answer is 2^(m+k)-1.

If you're insistent, then the for loop looks like this:

s = 0;
for i=1:qu
  s = s + nchoosek(m+k,i);
end

The function nchoosek can take a vector as the first argument, but not as the second.

Upvotes: 2

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