[Rdkit-discuss] MMFF constraints question

2014-06-03 Thread James Davidson
Dear All (but mainly Paulo!),

I have really been appreciating the MMFF implementation in RDKit - particularly 
now with the ability to add position / distance / angle / torsional constraints!
I have a couple of naïve questions; and apologise in advance if I have missed 
answers to these in the documentation / method doc-strings...

1.  This is a simple one - but just to categorically confirm - 
ff.CalcEnergy() gives results in kcal/mol units, right?
2.  Now onto force constants...  I see from the unittest (aka documentation 
if you can't find anything else) 'testConstraints.py' that the value of 1.0e5 
is used in the tests.  1.0e5 what?  And should this be viewed as a strong, 
modest, or weak restraint?  Presuming this constant is somewhat like saying how 
springy a spring is(?), then what is a sensible value to give me a super-strong 
steel joist that would essentially resist everything (or is 1.0e5 it)?
3.  Final thing:  the problem with making something really good / useful is 
that people get used to it and then start wanting more!  How's the GBSA 
implicit solvation coming on?   : )

Kind regards

James


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Re: [Rdkit-discuss] MMFF constraints question

2014-06-03 Thread James Davidson
Hi Paolo,

First of all - please see this time my brain has engaged quicker than my 
English-biased touch-typing - and I have spelt your name correctly(!).
Thanks for the very clear explanation on force constants - this is really 
helpful!

And, regarding your new non-academic position vs continued 'forcefield tools' 
development in RDKit - I kind of suspected the answer before I asked!  Oh well, 
my non-academic position of course gives me access to commercial 
implementations of MMFF + implicit solvation...  It's just not nearly as fun!  
: (

Kind regards

James


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