how to multiply 2 matrix A of dimension 5*4 and matrix B of dimension 4*1 upto k times?

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);

[KSSV]

What problem you face with this?

[PLACEIUS NISHIGA G]

we are getting wrong outputs.Could you suggest a solution for this.

[Birdman]

Check my answer.

Answer 1

[Birdman]

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))

[PLACEIUS NISHIGA G]

your code works good.thankyou.

[Birdman]

You are welcome.

Answer 2

[Andrei Bobrov]

m=5;
n=4;
k=3;
x = 2*(rand(n,1) > .5) - 1;
p = rand(m,n,k);

y = squeeze(sum(bsxfun(@times,p,reshape(x,1,[])),2))

[PLACEIUS NISHIGA G]

The code works only once.Could you suggest by modifying upto K times.

[Andrei Bobrov]

What by modifying ?