Description

This example turfs up a bug in the NL code generation: trac #2092.
The 23.5.2 system (last in the 23.5 series) was OK.
The problem exists in all of 23.6, 23.7.1, and 23.7.2,
but is fixed in maintenance release 23.7.3

Contributor: Alex Meeraus, Aug 2011

Small Model of Type : GAMS

Category : GAMS Test library

Main file : nlcode6.gms

$title Test for NL code bug from Dist 23.6 (NLCODE6,SEQ=534)

$onText
This example turfs up a bug in the NL code generation: trac #2092.
The 23.5.2 system (last in the 23.5 series) was OK.
The problem exists in all of 23.6, 23.7.1, and 23.7.2,
but is fixed in maintenance release 23.7.3

Contributor: Alex Meeraus, Aug 2011
$offText

positive variable x, y;
variable obj,w;

equation eq_obj, f;

eq_obj.. obj=E=w;
f.. w =G= edist[1+sqr(x),2+sqr(y)];

x.fx=2; y.fx=3;

model mymodel /eq_obj,f/;

solve mymodel using NLP minimizing obj;

abort$(abs(obj.l-12.08304597)>1e-5) 'incorrect code generation';