Hi,

Thanks for the quick replies all. Thanks to choroba for linking to uniqvec, which I must have missed during reading the documentation.

Thanks to vr for the good example code, this clears things up a bit. I came to the conclusion that my whole approach was incorrect (which I kind of expected when learning PDL).

I am building up the matrix vector by vector, so if we consider each vector as a single entity (which is what I am doing), then rather than a 2D matrix of vectors, in essence I have a 1D vectors of entities. Therefore, I am choosing to build the lookup table during creation.

Many thanks all.