Given the matrix x, return the sum of all elements of matrix.

Example:

 Input  x = [ 1 2 0 0 0
              0 6 9 3 3 ]
 Output y is 24.
 Input  x = [ 1 NaN 0 0 0
              0 6 9 3 3 ]
 Output y is NaN.

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Last Solution submitted on Jun 02, 2026

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