Hierarchy for customizing options

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One needs to be aware of the hierarchy for options when customizing GAMS on a machine or for a job as some specifications cannot be over ridden.  In particular, the priorities are as follows

1.Command line specifications on GAMS command line or in IDE command line box.
2.Command line specifications in IDE additional parameters box reached by going to file, options and execute.
3.Option command specifications as discussed in the option command chapter.
4.IDE specifications for output page size and other customizable items.
5.GMSPRMxx.txt specifications.

where a higher priority setting cannot be overwritten by a lower priority setting.  Thus, if one sets optfile=2 on the command line this will overcome a specification like a line stating

 

option optfile=1;

 

in the GAMS program.