matrix multiplication with different sizes

i have two arrays of sizes n and n*k i want to multiply the the first element of first matrix with first k elements and so on.

[Dyuman Joshi]

"so on"

How exactly do you want to proceed? Multipy with the next k elements or the second element from first matrix? Give us an example with the following (n=4, k=5) -

y=spiral(4) %4*4 matrix

y = 4×4

7 8 9 10 6 1 2 11 5 4 3 12 16 15 14 13

z=reshape(1:4*5,4,5) %4*5 matrix

z = 4×5

1 5 9 13 17 2 6 10 14 18 3 7 11 15 19 4 8 12 16 20

[kriti]

first element with first k

second element with second k like that

Answer 1

[Hrusheekesh]

hi kriti can you try this

x=repelem(a,k);
b=b.*x;