Merge pull request scipopt#356 from SCIP-Interfaces/sm/probingbounds

adds bound changes in probing

CHANGELOG.md

@@ -15,6 +15,7 @@
 - add Model.applyCutsProbing and Model.propagateProbing
 - add Model.separateSol
 - add methods to work with nonlinear rows
+- adds chgVarUbProbing and chgVarLbProbing to change a variables upper or lower bound during probing mode.
 
 ## 2.2.3 - 2019-12-10
 ### Added

src/pyscipopt/scip.pxd

@@ -539,6 +539,8 @@ cdef extern from "scip/scip.h":
     SCIP_RETCODE SCIPgetProbingDepth(SCIP* scip)
     SCIP_RETCODE SCIPbacktrackProbing(SCIP* scip, int probingdepth)
     SCIP_RETCODE SCIPchgVarObjProbing(SCIP* scip, SCIP_VAR* var, SCIP_Real newobj)
+    SCIP_RETCODE SCIPchgVarUbProbing(SCIP* scip, SCIP_VAR* var, SCIP_Real newbound)
+    SCIP_RETCODE SCIPchgVarLbProbing(SCIP* scip, SCIP_VAR* var, SCIP_Real newbound)
     SCIP_RETCODE SCIPsolveProbingLP(SCIP* scip, int itlim, SCIP_Bool* lperror, SCIP_Bool* cutoff)
     SCIP_RETCODE SCIPendProbing(SCIP* scip)
     SCIP_RETCODE SCIPfixVarProbing(SCIP* scip, SCIP_VAR* var, SCIP_Real fixedval)

src/pyscipopt/scip.pyx

@@ -3766,6 +3766,26 @@ cdef class Model:
         """changes (column) variable's objective value during probing mode"""
         PY_SCIP_CALL( SCIPchgVarObjProbing(self._scip, var.scip_var, newobj) )
 
+    def chgVarLbProbing(self, Variable var, lb):
+        """changes the variable lower bound during probing mode
+
+        :param Variable var: variable to change bound of
+        :param lb: new lower bound (set to None for -infinity)
+        """
+        if lb is None:
+           lb = -SCIPinfinity(self._scip)
+        PY_SCIP_CALL(SCIPchgVarLbProbing(self._scip, var.scip_var, lb))
+
+    def chgVarUbProbing(self, Variable var, ub):
+        """changes the variable upper bound during probing mode
+
+        :param Variable var: variable to change bound of
+        :param ub: new upper bound (set to None for +infinity)
+        """
+        if ub is None:
+           ub = SCIPinfinity(self._scip)
+        PY_SCIP_CALL(SCIPchgVarUbProbing(self._scip, var.scip_var, ub))
+
     def fixVarProbing(self, Variable var, fixedval):
         """Fixes a variable at the current probing node."""
         PY_SCIP_CALL( SCIPfixVarProbing(self._scip, var.scip_var, fixedval) )