If you know a function which is used to create a matrix, you can solve this problem easily !
I thought you referred to the function blkdiag(), but I am surprised to know that it is not the case (for a one-liner)!
Determine Whether an array is empty
Is the input divisible by 3?
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Find the index of n in magic(n)
Determinant without using det()
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