MATLAB: How to reshape a matrix in cases where the reshape function might not work properly

Question

I have a 4×5 array of zeroes which I would like to populate using elements from this 1 x 20 vector.:

X = [19    14    18     4    17    21     4     0    13     3    19    14    15    17    14    19     4     2    19    88]

The first 5 elements of X must go in the first row of the array A, and the next 5 elements of X must go into the 2nd row, and so on…

I've tried setting up 2 for loops, but I'm stuck with the index:

for i = 1:4
    for a = 1:5
        A(i,a) = X(%??)
    end
end

I'm not sure how to index X such that, for example, A(2,1) = X(1,6)

As another attempt to fix this, I was able to reshape X into a 5 x 4 array which satisfied my conditions (the first 4 elements of X are in row 1, the next 4 are in row 2, etc.) however, it is a 5×4 array and not a 4×5 array:

Y = 19    14    18     4
    17    21     4     0
    13     3    19    14
    15    17    14    19
     4     2    19    88

Attempting to use reshape to turn it into a 4×5 array does not work since it doesn't give me the correct output, and neither does transposing the array. I'd appreciate some help with this. Thanks!

Answer 1

A = reshape(X, 5, 4).' ;