2015-10-11 9:11 GMT-06:00 Jan Henning Peters <[email protected]>:
> Hi Frank,
>
> I usually get the same error, when the distribution has a value of 0.0 after
> it has a non-zero value, which in your distribution happens around r=0.35.
> Looking at your distribution, my guess is that you are using more than one
> cg particle per molecule and are including the distance between bonded
> particles in your distribution, resulting in the peak around r=0.29. If you
> used Votca's csg_stat to calculate the distribution, this should not happen
> when you define the bond in the option file (as you should also for the ibi
> calculation).
Yup, the A-A.dist.tgt has a couple of negative values in them, which
is for sure bogus.
And usually it is useful to set the min to some value bigger than
zero, 0.25 seems a good values for your case.

Christoph
>
> Hope that helped,
> Jan
>
>
> Am 11.10.2015 um 14:57 schrieb frank Zack:
>
> Hi all,
>
> Im trying ibi to find a non-bonded potential for the interaction of a coarse
> grained polypropene polymer.
> However, csg_inverse does not work properly... it fails boltzmann-inverting
> my smoothed distribution (from All-Atom relaxation)
>
> the error is: "....Only 4 points are valid after Boltzmann inversion from
> file 'A-A.dist.tgt', please check if your distribution is a valid dist..."
>
> My question is: How's a proper dist defined???
> whats wrong with my dist (See appendix)?
>
> Thx for any hints
> regards,
> frank.
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-- 
Christoph Junghans
Web: http://www.compphys.de

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