Reference: Rf

This option specifies the name of the file on which to place extensive reference map information. New information is appended to this file. String input is expected.

The command is implemented with the syntax

Reference=filename

or

Rf=filename

Setting Rf or Reference to the string "default" causes GAMS to create a reference file with the GMS file root name and a REF extension.

Thus gams trnsport rf=default will cause GAMS to write the reference file trnsport.ref.