Most frequently asked Cody problem.
Back to basics 23 - Triangular matrix
Sum of diagonals elements of a matrix
Test Problem; Create a 5x5 array containing all ones
Sum the squares of numbers from 1 to n
Calculate area of sector
Change the first and last diagonal element of the identity matrix to zero
Case-insensitive Character Detection
Crate a vector of logarithmically spaced
Convert decimal to hex as shown in test cases
Generate vector according to sign of vector
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