How to cater with?

GAMS
1

Dear All,

Wish you all the best.

I received the error “An equation is inconsistent with other equations in pre-triangular part”. How can I proceed to remove this error? I will be great full for your help.

–
BAZMI

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2

Dear Arne,

Thanks for your reply and help. I checked time and again but couldn’t find the clue. :slight_smile: Let me check again … Actually, I have some complicated equations, if I control LHS, RHS goes over/under controlled. So, I introduced intermediate variables, about which I am not sure…That’s why, I failed to find the point of error :slight_smile:…
Any suggestion???

On Fri, Aug 19, 2011 at 6:16 PM, Arne Stolbjerg Drud wrote:

Bazmi:



The problem comes from constructs like this:



variable x1, x2, obj;

equation e1, e2, e3, objdef;



e1 … x1 =E= 1;

e2 … x2 =E= 2;

e3 … x1 + x2 =E= 4;

objdef … obj =E= sqr(x1+x1);



model m / all /;

solve m using nlp minimizing obj;



Equation e1 and e2 are solved giving x1=1 and x2=2 and then e3 is inconsistent since all variable appearing in the equation have been determined and the equation is infeasible given these value. Look at the infeasible equation in your model and the variables that appear in it and trace back what the value of these variables are and where the values come from.



Good luck



Arne


\

Arne Stolbjerg Drud

ARKI Consulting & Development A/S

Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark

Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: adrud@arki.dk



Fra: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] PÃ¥ vegne af AQEEL AHMED BAZMI
Sendt: 19. august 2011 01:21
Til: gamsworld@googlegroups.com
Emne: How to cater with?



Dear All,



Wish you all the best.



I received the error “An equation is inconsistent with other equations in pre-triangular part”. How can I proceed to remove this error? I will be great full for your help.


\

BAZMI

–
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To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
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\

Engr.AQEEL.A.BAZMI

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3

Thanks dear Arne,

I will try the same.

On Fri, Aug 19, 2011 at 7:48 PM, Arne Stolbjerg Drud wrote:

There seems to be a problem with the messages in the latest version of conopt.



Try to run you rmodel with nlp=conopt4 and you may get some more informative messages in the *.lst file that explains the solution order.



Good luck



Arne


\

Arne Stolbjerg Drud

ARKI Consulting & Development A/S

Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark

Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: adrud@arki.dk



Fra: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] PÃ¥ vegne af AQEEL AHMED BAZMI
Sendt: 19. august 2011 12:27
Til: gamsworld@googlegroups.com
Emne: Re: How to cater with?



Dear Arne,



Thanks for your reply and help. I checked time and again but couldn’t find the clue. :slight_smile: Let me check again … Actually, I have some complicated equations, if I control LHS, RHS goes over/under controlled. So, I introduced intermediate variables, about which I am not sure…That’s why, I failed to find the point of error :slight_smile:…

Any suggestion???



On Fri, Aug 19, 2011 at 6:16 PM, Arne Stolbjerg Drud wrote:

Bazmi:



The problem comes from constructs like this:



variable x1, x2, obj;

equation e1, e2, e3, objdef;



e1 … x1 =E= 1;

e2 … x2 =E= 2;

e3 … x1 + x2 =E= 4;

objdef … obj =E= sqr(x1+x1);



model m / all /;

solve m using nlp minimizing obj;



Equation e1 and e2 are solved giving x1=1 and x2=2 and then e3 is inconsistent since all variable appearing in the equation have been determined and the equation is infeasible given these value. Look at the infeasible equation in your model and the variables that appear in it and trace back what the value of these variables are and where the values come from.



Good luck



Arne


\

Arne Stolbjerg Drud

ARKI Consulting & Development A/S

Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark

Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: adrud@arki.dk



Fra: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] PÃ¥ vegne af AQEEL AHMED BAZMI
Sendt: 19. august 2011 01:21
Til: gamsworld@googlegroups.com
Emne: How to cater with?



Dear All,



Wish you all the best.



I received the error “An equation is inconsistent with other equations in pre-triangular part”. How can I proceed to remove this error? I will be great full for your help.


\

BAZMI

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

–
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\

Engr.AQEEL.A.BAZMI

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\

Engr.AQEEL.A.BAZMI

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