What could be creating syntax errors in my AMPL code?

Question

For this ampl code, I keep getting syntax errors when I try to run this mod file. I'm not quite sure where I'm going wrong, as I have the correct equations written down.

How do I go about fixing this?

var P >= 0;

var Q >= 0;

var R >= 0;

var S >= 0;

var T >= 0;

var U >= 0;

var V >= 0;

maximize Cost: 4*P + 5*Q + 1*R + 3*S - 5*T + 8*U;

subject to Sup1: P - 4*R + 3*S + T + U + 2*V = 1 ;

subject to Sup2: 5*P + 3*Q + R − 5*T + 3*U <= 4 ;

subject to Sup3: 4*P + 5*Q − 3*R + 3*S − 4*T + U <= 4 ;

subject to Sup4: − Q + 2*S + T − 5*U <= 5 ;

subject to Sup5: −2*P + Q + R + S + 2*T + 2*U <= 7 ;

subject to Sup6: 2*P − 3*Q + 2*R - S + 4*T + 5*U <= 5 ;

vitaut · Accepted Answer · 2014-10-27 19:42:49Z

2

The syntax error is caused by the Unicode minus sign −. To fix it replace all occurrences of − with the standard ASCII minus sign -.

answered Oct 27, 2014 at 19:42

vitaut

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