| m | Number of rows |
| n | Number of columns |
| x | The matrix |
| Return: | The trace (sum of the diagonal entries) |
The trace function computes the trace of the input matrix
Example:
IMPORT STD; STD.BLAS.Types.matrix_t x := [1.0, 2.0, 3.0, 2.0, 2.0, 2.0, 4.0, 4.0, 4.0]; trace_of_x := STD.BLAS.trace(3,3,x); // the trace is 7