`TRACE`,*variable, mat1*,,[*factor*]

Computes *variable* = *factor**tr(*mat1*).

`TRACE`,*variable, mat1, mat2*,[*factor*],[*facnuc*]

Computes *variable* = *factor**trace(*mat1 mat2*) + facnuc*opnuc.

The result of the trace operation is stored in the MOLPRO variable *variable*,
which can be used in subsequent operations.

If *factor* is not given, one is assumed. If *facnuc* is given, the nuclear contribution
multiplied by facnuc is added. It is assumed that either *mat1* or *mat2* has a nuclear contribution.
The default for *facnuc* is zero.

molpro@molpro.net 2019-01-19