Error from RVEA algorithm when the problem has no feasible solutions a…

…nyoptimization#487
Skylake37 · Oct 17, 2023 · f3f4b83 · f3f4b83
1 parent 2a63574
commit f3f4b83
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/pymoo/algorithms/moo/rvea.py b/pymoo/algorithms/moo/rvea.py
@@ -133,8 +133,9 @@ def __init__(self, ref_dirs, alpha=2.0) -> None:
         self.gamma = calc_gamma(self.V)
 
     def adapt(self):
-        self.V = calc_V(calc_V(self.ref_dirs) * (self.nadir - self.ideal))
-        self.gamma = calc_gamma(self.V)
+        if self.nadir is not None:
+            self.V = calc_V(calc_V(self.ref_dirs) * (self.nadir - self.ideal))
+            self.gamma = calc_gamma(self.V)
 
     def _do(self, problem, pop, n_survive, algorithm=None, n_gen=None, n_max_gen=None, **kwargs):