Variables already defined

[Angela Lee]

Hi, 

Whenever I run Q2.mod, I get an error that a variable is already defined. I am unsure as to what this means and how I can fix it. Further, when I input “show;” it only shows constraint 1. Why are my other four constraints invalid/not being considered? 

I have attached a picture of my screen.

Thanks in advance,

Angela

[Robert Fourer]

Your model contains "var c2;" and then also "subject to c2: ...". You cannot use the same name for both a variable and a constraint, so when AMPL's processor reaches the constraint you get a "c2 is already defined" error.

After the error, the AMPL processor has stopped in the middle of a command, as shown by the "ampl?" prompt. As a result the rest of the commands were not processed, and also your "reset;" was not processed. This was the source of all the subsequent errors, which you should not see again once the first error is fixed.

Bob Fourer
am...@googlegroups.com

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