[Egon Willighagen]

qsar.descriptors.atomic.ProtonTotalPartialChargeDescriptor length depends on the input IAtom, and not just on the parameters (which it actually does not have). Therefore, there is no option of ever gettting a rectangular data matrix.

No idea how to fix this... suggestions, or just remove it?

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A possibility is to have a fixed length (say 4) descriptor and if an atom has less then 4 protons, the remaining values get set to NaN

any resolution on this?

No, not yet, I think... I think we just patch it to do 4 atoms with the NaN filling...

Updated so that the descriptor is of fixed value, following the last comment