RE: [Help-glpk] i have problem

[Robert Fourer]

Your objective function uses xiA without a subscript (twice)

and has two more left parentheses than right parentheses.

 

Mysterious syntax error messages often have their root

in simple errors like these.  If you write your cost function

on several lines, the errors may be easier to see.

 

As written, the objective function of this problem is nonlinear

in the variables, so GLPK won’t be able to solve it.  Instead

you could try some of the nonlinear solvers at

http://www-neos.mcs.anl.gov/neos/ that accept AMPL input.

 

 

 

---

From: address@hidden [mailto:address@hidden On Behalf Of pp pp
Sent: Saturday, December 18, 2004 10:14 PM
To: glpk
Subject: [Help-glpk] i have problem

 

i have problem

 

i'm student and my first time to find optimize value by GLPK but I have problem

 

my program :

 

set I;                           /*No.*/

set Q;                         /*sta.*/

set P;                          /*section*/

 

param siq{i in I,q in Q};          /*stop time*/

param Wi{i in I};                    /*value of time*/

param Ti{i in I};                      /*value of time*/

param Dp{p in P};                  /*distance*/

param Dpl{p in P};                 /*limit distance*/

param vip{i in I,p in P};          /*max speed*/

param vlip{i in I,p in P};          /*limit speed*/

param xiD{i in I};                   /*start time*/

param xiA{i in I};                   /*end time*/

 

var vzip{i in I,p in P},integer,>=1;       /*need speed*/

var vzlip{i in I,p in P},integer,>=1;/*need limit speed*/

 

minimize cost:((sum{i in I,q in Q,p in P}Wi[i]*((xiD[i]+siq[i,q]+((Dp[p]-Dpl[p])/(vzip[i,p]/60)+(Dpl[p]/(vzlip[i,p]/60)))-xiA))+(sum{i in I,q in Q,p in P}Ti[i]*((xiD[i]+siq[i,q]+((Dp[p]-Dpl[p])/(vzip[i,p]/60)+(Dpl[p]/(vzlip[i,p]/60)))-xiA)));

 

s.t.speed_max{i in I,p in P}:vzip[i,p]<=vip[i,p];

s.t.speed_limit{i in I,p in P}:vzlip[i,p]<=vlip[i,p];

 

data;

set I := 35 37 86 168;

set Q:= 1 2 3 4 5;

set P:= 1 2 3 4;

 

 

param siq:       1          2          3          4          5:=

35      0          0          0          0          0

37      0          0          0          0          0

86      0          0          0          0          0

168    6          0          1          0          0;

 

param Wi:= 35 150 37 150 86 100 168 50;

param Ti := 35 150 37 150 86 100 168 50;

param Dp:= 1 9.4 2 6.74 3 7.26 4 9.73;

param Dpl:= 1 0 2 0 3 0 4 0.625;

param vip:       1          2          3          4:=

35      90        90        90        90

37      90        90        90        90

86      90        90        90        90

168    90        90        90        90;

param vlip:      1          2          3          4:=

35      1          1          1          50

37      1          1          1          50

86      1          1          1          50

168    1          1          1          50;

 

end;

 

 

when I run glpsol it show

ts7.mod:18: operand following / has invalid type

context:q]+((Dp[p]-Dpl[p])/(vzip[i,p]/60)+

model processing error

 

 

why???

Help me please

 

 

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com