Dear Chimera Dev. Team, I'm trying to add energy calculations in my script. To do so, I started with the class Minimize, defining nsteps as 0 but I think that it is not so tidy. In chimera/share/MMMD/MMTKinter.py I found the function minimize and a line that says: msg = "Initial energy: %f" % self.universe.energy() . My question is... How can I invoke this self.universe.energy() in order to get the energy? I tried to write a new class in MMMD/base.py and a new function in MMMD/MMTKinter.py in order to obtain a function like "MMMD.base.energy()" to write in my script but I think that I am doing it more complex that it is... Anyone has any idea for doing it successfully? Thanks, Elisabeth Ortega-Carrasco Ph.D. Student @ Universitat Autònoma de Barcelona.