how to solve a submodel by assigning upper variables to some value

[施云辉]

Hi, I'm working with a bi-level problem, and I want to solve the bi-level problem with benders-decomposition method. And one step of my method is to solve a submodel by assigning the variables of the upper model to some value. For example, I have a ConcreteModel M, with varible M.x, and a SubModel M.sub, with variable M.sub.y  and some constraints and an objective. I want to assign M.x to 0, and solve the M.sub. Is there any way to do this ?

[Michael Bynum]

I believe the following should work:

M.x.fix(0)

opt = SolverFactory('pick_a_solver')

results = opt.solve(m.sub)

Michael

[施云辉]

Thanks a lot, it works. And it's cool, I think the 'fix' method should be documented.

在 2018年4月14日星期六 UTC+8上午1:54:37，Michael Bynum写道：

[David Woodruff]

https://software.sandia.gov/downloads/pub/pyomo/PyomoOnlineDocs.html#_fixing_variables_and_re_solving

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