Bob Hanson wrote:
> great. Rolf, am I right that
> 
> select 40-43
> 
> should select ALL ranges of that sort within a chain -- because some 
> older PDB files have the waters in with the protein all as one chain, so 
> there is a duplicate set of numbers within a chain?
> 
> I was thinking yesterday that maybe we should select only the first set, 
> because generally one expects protein when you select a range of 
> residues, and that the selection of waters was actually a bug.
> 
> But then I realized if we did that it would be impossible to select a 
> range of water molecules, so I changed it to iterate over the chain, 
> finding all ranges, not just the first.
> 
> What do you think?
> 

Yes, I agree that all matching ranges should be selected. I think it
should be the responsibility of the user to restrict this any further.

It is for example similar to the situation where you have a protein
chain and a DNA chain. If you just use "select 1-5" the residues from
both chains should be selected. If you want to select only protein you
have to add the chain identifier or use "select 1-5 AND protein".

Regards,
Rolf

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