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$11\mathrm{.}5\mathrm{.}3$: Interleaving columns of two arrays via reshape.

What command should finish this function to interleave the elements of two $2$D arrays by columns? The function works for any dimensions of the input arrays, given the two arrays have the same dimensions. Incorrect arrayout needs twice as many columns as the inputs.

function $[$arrayout$]=$ InterleaveCols$($arrayIn$1,$ arrayIn$2)$

$\%$ Interleave the elements in two $2D$ arrays column by column

$\%$ Assumes the dimensions of the arrays are identical

arrayIn$1)\%$ size of input arrays

both $=[$arrayIn$1$; arrayIn$2]\%$ stack arrays vertically

$\%$ Use reshape$()$ to move each $r$ elements, column order, to

output

arrayout $=$

end

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