Remove method calls in ab_initio_solids.py

Author: bobmyhill

misc/benchmarks/ab_initio_solids.py

@@ -58,7 +58,8 @@
     pressures = np.empty_like(volumes)
     for temperature in temperatures:
         for i, volume in enumerate(volumes):
-            pressures[i] = phase.method.pressure(temperature, volume, phase.params)
+            phase.set_state_with_volume(volume, temperature)
+            pressures[i] = phase.pressure
         ax_P.plot(
             volumes * 1e6,
             pressures / 1e9,
@@ -77,8 +78,8 @@
     energies = np.empty_like(volumes)
     for temperature in temperatures:
         for i, volume in enumerate(volumes):
-            energies[i] = phase.method.molar_internal_energy(
-                0.0, temperature, volume, phase.params
+            phase.set_state_with_volume(volume, temperature)
+            energies[i] = phase.molar_internal_energy
             )
         ax_E.plot(
             volumes * 1e6,