Gleb Belov
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Gleb Belovさんが投稿を作成しました:
Branch-cut(-price) node LP warm start
Hi, assume someone implements branch-and-cut... and needs to solve the LP relaxations in different nodes. This means, after solving the LP of one node, we can switch to a very different node (diffe...
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Gleb Belovさんがコメントを作成しました:
Oh I think every constraint type has its own pool, there is no overall ordering of constraints. Resolved then.
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Gleb Belovさんが投稿を作成しました:
QCP duals
回答済みHi, when retrieving duals of linear and quadratic constraints, I noticed that methods GRBgetdblattr(element) interpret the indices as the indices in the subset of only quadratic constraints, or, if...
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Gleb Belovさんがコメントを作成しました:
Well I guess an alternative way is to have 2 opposite constraints (<=, >=). For the C API, this is the only 'official' way because GRBaddqconstr only documents GRB_LESS_EQUAL or GRB_GREATER_EQUAL, ...
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Gleb Belovさんがコメントを作成しました:
A similar question for quadratic range constraints: is the extra slack variable the best way of modelling as well?
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Gleb Belovさんがコメントを作成しました:
When providing LP warm start (C/VBASIS or P/DSTART) after GRBaddrangeconstr(), I receive ''Warning, invalid warm-start basis discarded" (printer 2x for some reason). Will this be fixed or the advic...
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Gleb Belovさんがコメントを作成しました:
Hi Jaromił, the instance (recognized as convex quadratic, despite the equality) is this: MaximizeobjSubject Top_times_0: - obj + [ x ^2 ] = 0Boundsx <= 10obj <= 100End When I call gurobi_cl ResultF...
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Gleb Belovさんが投稿を作成しました:
ObjBoundC not available
回答済みHi, when solving a simple quadratic model, Gurobi finishes at root node. Then, trying to retrieve ObjBoundC, we get Unable to retrieve attribute 'ObjBoundC'.Failed to get the best bound. Gurobi err...
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Gleb Belovさんが投稿を作成しました:
How does Gurobi compute the IIS for infeasible models with integer variables?
From the article "How does Gurobi compute the IIS for infeasible models?" it is not clear what happens for non-convex models (although it is helpful as a starting point). Is there any public inform...
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Gleb Belovさんが投稿を作成しました:
Exporting parameter list
For a modeling system like MiniZinc it would be useful to see the list of parameters supported by the solver. There are functions in gurobi.h allowing access to the list and feasible/default values...