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 a vector is monotonically increasing
Sums with Excluded Digits
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
frame of the matrix
Can we make a triangle?
Determinant without using det()
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