vectorindex

Evaluate n-dimensional arrays at vectors of indices.

VECTORINDEX evaluates an n-dimensional array at the indices specified in vector form. For example, if v=[1;3;1] and A is a 3-dimensional array, then vectorindex(A,v) is the same as A(1,3,1). The code utilizes linear indexing, but it is written for speed; all for loops are avoided. This is intended particularly for use with high-dimensional tensors, but will also work on vectors and matrices.