Fix specrange return type to be `Float64`

JuliaQuantumControl / QuantumPropagators.jl

Propagators for Quantum Dynamics and Optimal Control

https://juliaquantumcontrol.github.io/QuantumPropagators.jl/

MIT License

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Fix specrange return type to be `Float64` #24

Closed goerz closed 2 years ago

goerz commented 2 years ago

By definition (according to the documentation, the specrange is on the real axis, and the returned values should be Float64. In particular, we should not return complex numbers.