Generating all combinations containing at least one element of a given set in Matlab

Question

I use combnk to generate a list of combinations. How can I generate a subset of combinations, which always includes particular values. For example, for co

Answer 1

Just to improve Steve's answer : in your case (you want all combinations with 3 and/or 5) it will be

• all k-1/n-2 combinations with 3 added
• all k-1/n-2 combinations with 5 added
• all k-2/n-2 combinations with 3 and 5 added

Easily generalized for any other case of this type.