MATLAB: How to multiply 2 matrix A of dimension 5*4 and matrix B of dimension 4*1 upto k times

matrix multiplication

this is the code we tried .But we are not getting appropriate output
clc;
clear all;
m=5;
n=4;
k=3;
x=2*randint(n,1)-1;
p=rand(m,n,k);
y(m,1,k)=p(m,n,k).*x(n,1);

Best Answer

Firstly, x variable here is not 4x1 and also .* means elementwise multiplcation but you want to do matrix multiplication, therefore use the following code(Note that whatever your size is, which is k in this case, the matrices are going to be multiplied):
m=5;n=4;k=3;
x=2*randi(n,[n 1])-1
p=rand(m,n,k)
p2D=reshape(permute(p,[1 3 2]),[],size(p,2));
y=reshape(p2D*x,size(p,1),[],size(p,3))
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