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Showing content from https://github.com/qutip/qutip/issues/2646 below:

Instantiating a qt.QobjEvo with a qt.coefficient · Issue #2646 · qutip/qutip · GitHub

It is possible to instantiate a qt.QobjEvo object with a qt.coefficient. However, the "args" argument QobjEvo does not behave as expected. Is this a bug, or is it incorrect to pass a qt.coefficient object to qt.QobjEvo? I am using qutip v5.0.4

import qutip as qt
A = qt.sigmaz()
def f(t, args):
    return t + args["g"]

coeff = qt.coefficient(f, args={"g":1})

evo_1 = qt.QobjEvo([A, coeff])
evo_2 = qt.QobjEvo([A, coeff], args={"g:2}) # Updating the args dictionary does nothing.

assert evo_1(1) == evo_2(1) 

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