The TRN_NEW routine may also be used to create a temporary transformation. This can be very convenient for internal use by an application because it avoids the need for an existing HDS structure to contain it. To create such a transformation, the ELOC argument to TRN_NEW should be replaced by a blank string (the NAME argument will then be ignored and may also be blank). Thus, if TRN_NEW were invoked by:
CALL TRN_NEW( NVIN, NVOUT, FOR, INV, PREC, COMM, ' ', ' ', LOCTR, STATUS )
then the locator LOCTR would subsequently be associated with a temporary transformation (i.e. a temporary HDS structure of type TRN_TRANSFORM).
TRANSFORM Coordinate Transformation Facility