Find sum of negative elements in row.
Example x=[1 -5 3 4 -6 6 7 8 9 10]
result = -11
Sum all integers from 1 to 2^n
UICBioE240 problem 1.13
modulus of a number
Find product of eigenvalues of n*n magic matrix.
Calculate the sum of elements of n*n Hilbert matrix.
Form a square matrix from four square sub-matrices
Opposite task convert string hexadecimal numbers array into array of decimal numbers .
Create a square matrix with given conditions
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