2 files changed, 7 insertions, 1 deletions
diff --git a/fg21sim/extragalactic/clusters/formation.py b/fg21sim/extragalactic/clusters/formation.py
index bc64eff..f8c6d3a 100644
--- a/fg21sim/extragalactic/clusters/formation.py
+++ b/fg21sim/extragalactic/clusters/formation.py
@@ -181,7 +181,10 @@ class ClusterFormation:
 
         References: Ref.[1],Sec.(3.1)
         """
+        logger.info("Simulating cluster formation: " +
+                    "M0={:.3g}[Msun] ...".format(self.M0))
         self.mtree = self._trace_formation(self.M0, dMc=self.merger_mass_min)
+        logger.info("Simulated cluster formation with merger tree")
         return self.mtree
 
     def _trace_formation(self, M, dMc, _z=None):
diff --git a/fg21sim/extragalactic/clusters/halo.py b/fg21sim/extragalactic/clusters/halo.py
index 0881a88..f7ec54b 100644
--- a/fg21sim/extragalactic/clusters/halo.py
+++ b/fg21sim/extragalactic/clusters/halo.py
@@ -19,6 +19,7 @@ import scipy.integrate
 import scipy.optimize
 
 from .cosmology import Cosmology
+from .formation import ClusterFormation
 from .solver import FokkerPlanckSolver
 from .units import (Units as AU, UnitConversions as AUC, Constants as AC)
 
@@ -100,7 +101,9 @@ class HaloSingle:
         Simulate the merging history of the cluster using the extended
         Press-Schechter formalism.
         """
-        raise NotImplementedError
+        self.formation = ClusterFormation(self.M0, self.configs)
+        self.mtree = self.formation.simulate_mergertree()
+        return self.mtree
 
     def calc_electron_spectrum(self):
         """