Plotting molecular properties for (sub)sets

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For a toxicology paper we are writing up, I need to create a few plots showing how the toxic and non-toxic molecules differ (or not) with respect to a few molecular properties, such as logP or the molecular weight. The rcdk package provides all, of course, except for a nice convenience method (or does it?) to make a plot. That is, I just want to do something like:

plot.propdist(
mols,
selections=list(all, actives, inactives),
descriptor=
"org.openscience.cdk.qsar.descriptors.molecular.WeightDescriptor",
main="", xlab="Weight"
)

And now I can. The result looks something like:

Not much difference in this plot. The colors can be changed, if you like, overwriting the rainbow defaults.

The source code of my method (licensed MIT):

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