feasible solution

src/simplexe.py

@@ -253,9 +253,14 @@ class Simplexe:
     def __isSolutionFeasible(self):
         # we MUST have that all BASIC variables are >= 0 to have a FEASIBLE solution
         # to iterate over basic variables do:
-        # for rowId, baseColId in enumerate(self.__basicVariables):
-        raise Exception(
-            'Not implemented', 'Simplexe.__isSolutionFeasible: missing code to be implemented.')
+
+        for rowId, baseColId in enumerate(self.__basicVariables):
+            if self.RHS[rowId] / self.__tableau[rowId][baseColId] < 0:
+                return False
+
+        # raise Exception(
+        #     'Not implemented', 'Simplexe.__isSolutionFeasible: missing code to be implemented.')
+        return True
 
     # returns index of entering col Id
     # return None or -1 if there is pivot