[SCIP] Slack of a dual constraint

[Lukas Schürmann]

Hi all,

I was wondering if there is a SCIP function that returns the slack of a 
dual (\leq) constraint (= Rhs - Lhs).

I am trying to sort my (primal) variables by that value as i am 
interested in the one with a low dual slack.

Obviously, (due to the complementary slackness) the variable that are 
not 0 have a dual slack of 0, but i am also interested in the rest of 
the variables.

For sure i could just calculate it by hand, but if such a function 
already exists i would like to use it.

Many thanks,

Lukas