The title and description of this problem have been cleaned up. Also, its test suite has been expanded and improved.
Multiply a column by a row
Replicate elements in vectors
Side of an equilateral triangle
Change the first and last diagonal element of the identity matrix to zero
Can we make a triangle?
Solve expression I
Display positive elements of matrix.
Calculate roots of polynomial given as vector array.
Set x value to each even index of vector y.
Solve expression II
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