On Tue, Jun 22, 2010 at 12:05 PM, Noel O'Boyle <baoille...@gmail.com> wrote:
> On 22 June 2010 09:06, Noel O'Boyle <baoille...@gmail.com> wrote:
>> On 22 June 2010 03:31, Craig A. James <cja...@emolecules.com> wrote:
>>> On 6/21/10 6:32 PM, Tim Vandermeersch wrote:
>>>> On Tue, Jun 22, 2010 at 3:17 AM, Geoffrey Hutchison
>>>> <ge...@geoffhutchison.net>  wrote:
>>>>>> The changes are in svn trunk. The current test set (aromatics.smi,
>>>>>> attype.00.smi&  nci.smi) is not good though.
>>>>>
>>>>> By that, I assume you mean that the current test set is not sufficient 
>>>>> for SSSR vs. LSSR? I can probably generate a *MUCH* larger test set if 
>>>>> that's what you need.
>>>>
>>>> There are not enough cases where the SSSR is not canonical. I already
>>>> added some (tetrahedron, cube, octahedron, fullerene 20&  60). While
>>>> the SSSR doesn't fail the canonical test for bridged rings, having 3
>>>> rings in the LSSR (2 in SSSR) gives more intuitive results for
>>>> substructure search.
>>>
>>> An interesting way to test various things is with the SMILES 
>>> "anti-canonical" option, -xC.  It's amazing how many algorithms can have 
>>> hidden atom-order dependencies.  Unfortunately, it's hard to make test 
>>> cases using -xC directly because the results are deliberately quasi-random.
>>>
>>> Craig
>>
>> Just a quick note, RDKit and OEChem both have something to say on the
>> subject of SSSR. See for example links and discussion at
>> http://ctr.wikia.com/wiki/Ring_counts_in_a_SMILES_file.
>
> Just to point out the four additional test failures due to recent SSSR
> checkins: http://my.cdash.org/index.php?project=Open%20Babel&date=2010-06-21

It seems the SSSR -> LSSR change in kekulize.cpp is the problem. I
changed it back until this is fixed. It might be that some result
files need updating though.

> - Noel
>

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