Adding name to constraints

[Suhas Pai]

Hey guys, 

I'm using a constraint list for a concrete model, cause the number of constraints I have is around 50k, and so it's much easier using a constraint list and adding expressions. Is there any way I can add names to this constraints as well. As of now the Pyomo Documentation has the doc argument only for constraints of the form : Model.c=Constraint(expr=whatever,doc='Name of constraint')

However, I want to add names to constraints like this:

Model.l=ConstraintList()

Model.l.add(Model.x+ Model.y >=2,name='Name of constraint')

Is there any way this can be done?

Thanks in advance

Suhas

[Bynum, Michael Lee]

import pyomo.environ as pyo

create model and variables

m.c = pyo.Constraint(pyo.Any)

m.c[name1] = m.x + m.y == 1

m.c[name2] = …

I hope this helps. 

Michael

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[Suhas Pai]

Hey,

When I generate the .gams file for this, the names of the constraints still dont show up in it.

Suhas

On Friday, June 14, 2019 at 5:55:49 PM UTC+5:30, Michael Bynum wrote:

import pyomo.environ as pyo

create model and variables

m.c = pyo.Constraint(pyo.Any)

m.c[name1] = m.x + m.y == 1

m.c[name2] = …

I hope this helps. 

Michael

On Jun 14, 2019, at 2:29 AM, Suhas Pai <suhasp...@gmail.com> wrote:

Hey guys, 

I'm using a constraint list for a concrete model, cause the number of constraints I have is around 50k, and so it's much easier using a constraint list and adding expressions. Is there any way I can add names to this constraints as well. As of now the Pyomo Documentation has the doc argument only for constraints of the form : Model.c=Constraint(expr=whatever,doc='Name of constraint')

However, I want to add names to constraints like this:

Model.l=ConstraintList()

Model.l.add(Model.x+ Model.y >=2,name='Name of constraint')

Is there any way this can be done?

Thanks in advance

Suhas

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[Nicholson, Bethany L.]

If you want constraint names to show up in the Gams file you need to add “symbolic_solver_labels=True” to your call to the solver:

 

solver.solve(model, symbolic_solver_labels=True)

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[Suhas Pai]

Yep this worked, I set it in the io_options for the model.write function.

Thanks!