Originally posted by: SystemAdmin

Hello Everyone,

Could someone please help me explain why I get an "Unbound expression" error with this constraint??
I am calculating angles between segments and I just want to set that if the denominator is zero then the angle is 90.

forall(f in Floor){
forall (p in aSegments){
if ((ChangeinX[f][p])== 0)
Angles0[f][p] == 90;
}
}

I have attached the .mod file as well,.

Any assistance rendered will be highly appreciated!
#ConstraintProgramming-General
#DecisionOptimization

Originally posted by: ol

Hello,
you cannot change an expression with a constraint, you need to build the expression with the "if" inside.

for example:

dexpr 

float Angles0[g in Floor][h in aSegments] = (ChangeinX[g][h]==0) ? 90 : (Slope0[g][h]-(Slope0[g][h]^3)/3+(Slope0[g][h]^5)/5-(Slope0[g][h]^7)/7);

and your can remove the lines:

forall(f in Floor){
forall (p in aSegments){
if ((ChangeinX[f][p])== 0)
Angles0[f][p] == 90;
}
}

The same problem appears with Angle1.
Regards,
Olivier
#ConstraintProgramming-General
#DecisionOptimization

Originally posted by: SystemAdmin

Thank you very much sir for helping me, it works now.
#ConstraintProgramming-General
#DecisionOptimization