Hi Hélène,

It's a custom algorithm developed by Warren DeLano. Some of the details are 
discussed in this post:

The implementation is in SelectorAssignSS in layer3/Selector.cpp:

Hope that helps.


> On Apr 4, 2018, at 11:59 AM, Hélène Kabbech <helene.kabb...@gmail.com> wrote:
> Dear pymol users,
> For a project based on proteins secondary structures (ss), I need to know 
> which algorithm/program does PyMol use to retrieve secondary structures from 
> a pdb file (when the ss datas are not display in the file).
> I retrieved ss using dssp program, and for some pdb files, it shows strands 
> or helix which are considered as loop by PyMol I guess.
> Thank you for your help.
> Best regards,
> Hélène

Thomas Holder
PyMOL Principal Developer
Schrödinger, Inc.

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