The title and description of this problem have been cleaned up. Also, its test suite has been expanded and improved.
Back to basics 9 - Indexed References
Flip the main diagonal of a matrix
Calculate the area of a triangle between three points
Find out total non zero element of matrix
For given vectors x,y find coresponding spline coefficients.
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Set x value to each even index of vector y.
Find the sides of an isosceles triangle when given its area and height from its base to apex
Select primes from the matrix.
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