[Scip] Get linear constraint to corresponding row

[Gerald Gamrath]

Dear Markus,

there is no such method in SCIP. The reason for this is, that in a 
general CIP setting, there is no one-to-one correspondence between 
constraints and rows. An "and" constraint, for example can add multiple 
rows to get a tighter relaxation of the constraint in the LP. The 
knapsack constraint handler, on the other hand, separates knapsack cover 
cuts, so generates multiple rows as well, even if the initial LP 
relaxation is just one row. Even more, a constraint handler could also 
separate cuts based on more than one constraint of its type.

Therefore, there is no general method for this. "SCIPgetRowLinear" is 
implemented in the linear constraint handler, which knows at that point 
that it creates exactly one row for each constraint and therefore can 
return the row.

What was it you wanted to do? Perhaps you can just work on the row (you 
can get the columns there and also get the variable for a column by 
"SCIPcolGetVar") or work directly on the linear constraints?

Best,
Gerald

Am 31.03.2014 19:13, schrieb Markus Kruber:
> Dear all,
>
> I have given a row in my LP which belongs to a linear constraint. Now 
> I am looking for a method which returns me this linear constraint.
> I already have found the method "SCIPgetRowLinear". In my 
> understanding the other direction.
>
> Best regards,
> Markus
>
>
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