SUM

Sum of the elements.

For vectors, SUM(X) is the sum of the elements of X.

For matrices, SUM(X) is a row vector with the sum over

each column. SUM(DIAG16RMFU2(X)) is the trace of X.

See also PROD2RCHBXR, CUMPROD1N5DKXG, CUMSUMKIA13Y.