sim.output.phys_fields.plot not good enough

phys_fields.plot raises too many errors (in particular in 3D).

from fluidsim import load_state_phys_file as load; sim=load()
# this works
sim.output.phys_fields.plot()
# but this raises a ValueError
sim.output.phys_fields.plot(time=200)

ValueError: key "rotz" not in state.keys_state_phys (['vx', 'vy', 'vz']).
The quantity cannot be computed because time is not None.

• When needed, a state can be added to contain data for a particular time and compute variables (we already have the operator).

Similarly,

from fluidsim import load_sim_for_plot as load; sim=load()
sim.output.phys_fields.plot()

raises

ValueError: key "rotz" not in state.keys_state_phys (['vx', 'vy', 'vz']).
"rotz" in sim.state.keys_computable but sim.params.ONLY_COARSE_OPER is True

(and sim.output.phys_fields.plot("vx") works).

• by default, a variable that we can get should be plotted.

• also check sim.output.phys_fields.animate