I introduced a binary variable in GAMS coding and trying to use a solver " solve using MIP minimizing fl ; " but it gives me error 56 which is " endongenous operands for * not allowed in linear models " .
I have no idea what this error means.can anyone please help me on this issue.
thanks in advance
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Dear Dehghani
Thanks for your question.
Following page might be helpful : http://support.gams.com/doku.php?id=gams:endogenous_-control_operations_not_allowed
Regards
Tavallali
On Wed, Mar 13, 2013 at 7:13 PM, Mohamad Dehghani wrote:
I introduced a binary variable in GAMS coding and trying to use a solver " solve using MIP minimizing fl ; " but it gives me error 56 which is " endongenous operands for * not allowed in linear models " .
I have no idea what this error means.can anyone please help me on this issue.
thanks in advance
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Hi Mohammed,
The error occurs when you try to solve non-linear models with linear solvers. Note that multiplying variables with another (binary) variable will make your model non-linear. You should either use a non-linear solver or try to reformulate your model to make it linear.
HTH!
On Wed, Mar 13, 2013 at 1:50 PM, Tavallali wrote:
Dear Dehghani
Thanks for your question.
Following page might be helpful : http://support.gams.com/doku.php?id=gams:endogenous_-control_operations_not_allowed
Regards
Tavallali
On Wed, Mar 13, 2013 at 7:13 PM, Mohamad Dehghani wrote:
I introduced a binary variable in GAMS coding and trying to use a solver " solve using MIP minimizing fl ; " but it gives me error 56 which is " endongenous operands for * not allowed in linear models " .
I have no idea what this error means.can anyone please help me on this issue.
thanks in advance
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This link might help
http://www.lmgtfy.com/?q=endogenous+operands+for+*+not+allowed+in+linear+models
Best,
Frank
On Wed, Mar 13, 2013 at 7:13 AM, Mohamad Dehghani wrote:
I introduced a binary variable in GAMS coding and trying to use a solver " solve using MIP minimizing fl ; " but it gives me error 56 which is " endongenous operands for * not allowed in linear models " .
I have no idea what this error means.can anyone please help me on this issue.
thanks in advance
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thank you very much
On Wednesday, March 13, 2013 11:13:37 PM UTC+8, Muha wrote:
Hi Mohammed,
The error occurs when you try to solve non-linear models with linear solvers. Note that multiplying variables with another (binary) variable will make your model non-linear. You should either use a non-linear solver or try to reformulate your model to make it linear.
HTH!
On Wed, Mar 13, 2013 at 1:50 PM, Tavallali wrote:
Dear Dehghani
Thanks for your question.
Following page might be helpful : http://support.gams.com/doku.php?id=gams:endogenous_-control_operations_not_allowed
Regards
Tavallali
On Wed, Mar 13, 2013 at 7:13 PM, Mohamad Dehghani wrote:
I introduced a binary variable in GAMS coding and trying to use a solver " solve using MIP minimizing fl ; " but it gives me error 56 which is " endongenous operands for * not allowed in linear models " .
I have no idea what this error means.can anyone please help me on this issue.
thanks in advance
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