[dynamics_options]
from qutip.solver.mesolve import MESolver, mesolve import numpy as np
Occasionally it is necessary to change the built in parameters of the dynamics solvers used by for example the .mesolve and .mcsolve functions. The options for all dynamics solvers may be changed by using the dictionaries.
[dynamics_options]
options = {"store_states": True, "atol": 1e-12}
Supported items come from 2 sources, the solver and the ODE integration method. Supported solver options and their default can be seen using the class interface:
[dynamics_options]
help(MESolver.options)
Options supported by the ODE integration depend on the "method" options of the solver, they can be listed through the integrator method of the solvers:
[dynamics_options]
help(MESolver.integrator("adams").options)
See classes-ode for a list of supported methods.
As an example, let us consider changing the integrator, turn the GUI off, and strengthen the absolute tolerance.
[dynamics_options]
options = {method="bdf", "atol": 1e-10, "progress_bar": False}
To use these new settings we can use the keyword argument options in either the .mesolve and .mcsolve function:
>>> mesolve(H0, psi0, tlist, c_op_list, [sigmaz()], options=options)or:
>>> MCSolver(H0, c_op_list, options=options)