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5.49.23  Exchange two columns : colSwap, colswap, swapcol

colSwap (or colswap or swapcol) takes three arguments : a matrix A and two integers n1 and n2.
colSwap returns the matrix obtained by exchanging in A the column of index n1 with the column of index n2.
Input :

colSwap([[1,2],[3,4]],0,1)

Output :

[[2,1],[4,3]]

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