matrix multiplication with different sizes

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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.

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Dyuman Joshi 2022-7-11

编辑：Dyuman Joshi 2022-7-11

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"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