MCP code: Endogenous relational opearations require model type "dnlp"

GAMS
1

Dear all,

I am using GAMS to solve one equilibrium problem with MCP formulation. Attached code is about the small example (I write the equation for each decision variable due to their relationship). However, I met one problem: Endogenous relational opearations require model type “dnlp”.
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Untitled_23.gms (2.46 KB)
Would someone give me some suggestions? Thank you very much.

Sincerely,
Guoyuan LI

2

After searching for error 57, I doubt that if the value of variables in the power function, will it lead to the error: Endogenous relational operations require model type “dnlp”?

Besides, if so, how can I fix it for the following equations:

c1def… c1 =e= 4t(‘1’)(1+0.15*power(x1/c(‘1’),4)); (note: power function for x1)
x1def… x1 =e= fij1+fij2+fij3+fij4+fkj1+fkj2+fkj3+fkj4;

Thank you.

3

Hi,

The equation mentioned in the error

 83  solve rs_transit using mcp;
****                            $57,256
****  57  Endogenous relational operations require model type "dnlp"
**** 256  Error(s) in analyzing solve statement.
**** The following MCP errors were detected in model rs_transit:
****  57 equation rationkjdriver.. VAR operands relational or boolean

reads

rationkjdriver.. fkj1+fkj2+fkj3=fkj4-d('kj') =e= 0;

I guesss the

...fkj3=fkj4...

is a typo an you might want to replace the “=” by a “+”.

I hope this helps!

Fred