If ‘data’ is a row vector and ‘summ’ is the desired sum, do this:
n = length(data);
d = dec2bin(0:2^n-1,n)-‘0’;
d = repmat(data,2^n,1).*(2*d-1);
f = find(sum(d,2)==summ);
s = d(f,:);
Each row of s should be a “solution” for you with appropriate sign changes, if any are found. It is assumed here that all elements of ‘data’ are integers - otherwise the exact equality requirement in the ‘find’ operation would be too demanding.
Warning: Beware of data vectors that are too long - they can result in an enormous ‘d’ array.
