Thomas Lettau

I have written a little modification that can read wannier90's `*_r.dat` output and create the transition dipole elements. If this is relevant, I could try to match the style of...

ENH: integrate: cumulative_simpson can support complex dtypes with small change

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### Describe your issue. If I use `cumulative_simpson` with a complex valued array, the imaginary part is discarded in `_cumulatively_sum_simpson_integrals`. The problem can be fixed easily by changing ```python sub_integrals...