[Open Babel] Question about Conformer Search

2014-03-17 Thread Torsten Sachse
Dear users of openbabel,

I am trying to generate conformers using openbabel. After trying  
confab, which takes rather long for large molecules, I tried the  
genetic algorithm and got really nice results. However, when I was  
testing different scoring methods I noticed that the results I  
obtained from "minrmsd" and "minenergy" looked fairly similar to those  
obtained using "rmsd".

Glancing over the source I found "minenergy" and "minrmsd" to be  
implemented but the respective command-line parameter ignored. Is  
there any particular reason for this?

I am using Open Babel 2.3.90 on a Linux system.

On another note: Using the conformer generation, I wanted to change  
the number of generations without change before convergence is  
considered to be reached. However, the command-line parameter  
"--converge #" output by "obabel -L conformer" is ignored since the  
programme actually looks for "--convergence #". I would suggest to  
change one of the two to avoid possible further confusion.

Best regards and thank you very much in advance

Torsten Sachse


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Re: [Open Babel] Two smi conversion problems

2014-03-17 Thread Scott McKechnie
I originally used "C=0" but using "[C-]#[O+]" gives the following roundtrip
for me:

[C-]#[O+] -> SDF -> [C-]#[OH]

Since writing the above I tried installing the latest version of Open Babel
and using "C=0" now gives an error and using "[C-]#[O+]" gives the correct
result. Thanks for the help with this, I think the new version has solved
the problem.

Best wishes,

Scott




On 13 March 2014 12:22, Geoffrey Hutchison wrote:

> Thanks for the reply, the sdf file was actually produced from a smiles
> string using gen3d.
>
>
> OK, I guessed that, but what was the original SMILES? And what version of
> Open Babel are you using? The current development code roundtrips:
>
> [C-]#[O+] -> SDF -> [C-]#[O+]
>
> Thanks,
> -Geoff
>
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