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# ColgenInstance:var_get(+Var, ++What, -Value)

Obtain information for an individual solver problem variable Var.

Var
  A solver problem variable for the solver associated with ColgenInstance
What
  Specification for information wanted (atom)
Value
  Returned value of What

## Description

Retrieve information about solver constraints and results related to a particular variable, for the colgen instance ColgenInstance. What can take one of the following values:

`mp_val`
  Returns the floating-point solution for variable Var.

`cost`
  Returns the master problem objective coefficient associated with the variable Var.

`coeffs`
  Returns a list of Id-Val pairs representing the constraint identifiers and coefficient values for the master problem constraints in which the coefficient is non-zero associated with the variable Var.

`aux`
  Returns the auxiliary information associated with the variable Var. The intended use is for subproblem information not represented in the master problem constraint coefficients.