how to multiply the input vector and weight matrix (X*iw+b)

Mr greg suggested output = repmat(b2,1,N) + LW*tanh(repmat(b1,1,N)+ IW*input). in this equation i am having 3 input and iw matrix of size 20X3.how to multiply three inputs vector and weight matrix

Answer 1

[Greg Heath]

The MAT in MATLAB stands for MATRIX. If

 size(IW) = [ 20 3 ]
 size(x)  = [ 3  N ]

Then the matrix multiplication command yields

size(IW*x) = [ 20 N ];

Hope this helps.

Thank you for formally accepting my answer

Greg