n-Mode Tensor - Matrix Product

according to the definition of De Lathauwer and as referenced by many papers.

B = A (x)_n U

((x)_n: is the multiplication operator, see screenshot!)

where:
A: tensor of R^( I_1 × I_2 × .. I_n × .. I_N )
U: matrix of R^( J × I_n)
B: output tensor of R^(I_1 × I_2 × .. J × .. I_N)
n: scalar within [1:N], specifying the mode

Syntax:
B = nmodeproduct(A, U, n)