error handling bilinear terms in Gurobi 9
Answeredhi
When I try to solve a model with bilinear terms in the constraints, in the form X*Y where X is signfree and Y in bounded, I get the error below:
Gurobi 9.0.0: NonConvex 2
Gurobi 9.0.0: Gurobi cannot handle quadratic equality constraints.
it should solve this model, but it does not.

Hi,
How are you using Gurobi? This does not look as though the error message is coming directly from Gurobi.
Are you setting NonConvex=2?
Silke
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I am a user of AMPL and solve models with Gurobi. here is a very simple mode, through I get this error for a sophisticated model as well.
constraint C1 must be "<= " otherwise it cannot handle!
var x ; var y;
var u >= 0; var v >= 0;
var r; var s; var t;
minimize obj: u+v ;
s.t. C1: r^2+s^2 = u^2;
s.t. C2_1: t <= v;
s.t. C2_2: t >= v;
s.t. C3: x+2 = r;
s.t. C4: y+1 = s;s.t. C5: x+y = t;0 
This was crossposted to the AMPL forum, where the issues were resolved.
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