Add SCIPvarMarkRelaxationOnly

Author: Joao-Dionisio

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Added support for knapsack constraints
 - Added isPositive(), isNegative(), isFeasLE(), isFeasLT(), isFeasGE(), isFeasGT(), isHugeValue(), and tests
 - Added SCIP_LOCKTYPE, addVarLocksType(), getNLocksDown(), getNLocksUp(), getNLocksDownType(), getNLocksUpType(), and tests
+- Added SCIPvarMarkRelaxationOnly
 ### Fixed
 - Raised an error when an expression is used when a variable is required
 ### Changed

src/pyscipopt/scip.pxd

@@ -817,6 +817,7 @@ cdef extern from "scip/scip.h":
     void SCIPvarSetData(SCIP_VAR* var, SCIP_VARDATA* vardata)
     SCIP_VARDATA* SCIPvarGetData(SCIP_VAR* var)
     SCIP_Real SCIPvarGetAvgSol(SCIP_VAR* var)
+    void SCIPvarMarkRelaxationOnly(SCIP_VAR* var)
     SCIP_Real SCIPgetVarPseudocost(SCIP* scip, SCIP_VAR* var, SCIP_BRANCHDIR dir)
     SCIP_Real SCIPvarGetCutoffSum(SCIP_VAR* var, SCIP_BRANCHDIR dir)
     SCIP_Longint SCIPvarGetNBranchings(SCIP_VAR* var, SCIP_BRANCHDIR dir)

src/pyscipopt/scip.pxi

@@ -1676,6 +1676,21 @@ cdef class Variable(Expr):
 
         """
         return SCIPvarGetAvgSol(self.scip_var)
+    
+    def markRelaxationOnly(self):
+        """
+        marks that this variable has only been introduced to define a relaxation
+
+        The variable must not have a coefficient in the objective and must be deletable.
+        If it is not marked deletable, it will be marked as deletable, which is only possible before
+        the variable is added to a problem.
+
+        Returns
+        -------
+        None
+
+        """
+        PY_SCIP_CALL(SCIPvarMarkRelaxationOnly(self.scip_var))
 
     def getNLocksDown(self):
         """