Outer Operation

e.g. Outer Product, Outer Sum, Outer Equals etc...

Calculates resultant matrix when the OPERATOR is applied to all combinations of the elements of vector A and the elements of vector B e.g. the outer product of A and B is outerop(A,B,'*'), the outer sum of A and B is outerop(A,B,'+')

If OPERATOR is omitted '+' is assumed

This function is equivalent to the APL language's circle.dot operation. e.g. in APL Ao.*B is the outer product of A and B % and Ao.+B is the outer sum.

Ideally, it would work on matrices but in practice
I've only ever needed to use it with vectors.