On Fri, Feb 3, 2023 at 12:47 PM Sanjeet Singh <[email protected]> wrote:
>
> Dear Christoph,
>
> Thank you for your reply.
>
> I have another question about min and max from force matching tutorial of 
> hexane.
>
>   <non-bonded>
>     <name>A-A</name>
>     <type1>A</type1>
>     <type2>A</type2>
>     <min>0</min>
>     <max>2.5</max>
>     <step>0.01</step>
>
> What is the use of min & max in the above code?
This min/max/step are not used in force matching, we just left them
there, so you could use the same file for csg_stat to calculate
distributions.
>
> <fmatch>
>       <min>0.34</min>
>       <max>1.0</max>
>       <step>0.02</step>
>       <out_step>0.01</out_step>
>     </fmatch>
>
> As far as I understand the min and max in the above code are used for force 
> matching. And the values of this min and max we get from the distribution 
> file of the respective interactions such that we have appreciable 
> probabilities in this range.
Correct!

>
> Also, what is the use of the following command:
>
> csg_call table linearop bond.pot bond.pot -1 0
>
> Is it simply to multiply the obtained potential by -1, as force is the -ve 
> derivative of potential?
Correct.

>
> Thank you.
>
> Sanjeet
>
>
>
> On Thursday, February 2, 2023 at 8:41:58 AM UTC-5 Christoph Junghans wrote:
>>
>>
>>
>> On Wed, Feb 1, 2023, 18:48 Sanjeet Singh <[email protected]> wrote:
>>>
>>> Hello Everyone,
>>>
>>> I am new to force matching. I want to use force matching for LAMMPS dump 
>>> file.
>>>
>>> I would like to know that do I need to have separate trajectory file 
>>> containing force data on each atom, or a single file containing both the 
>>> coordinates and trajectory information is sufficient for force matching.
>>
>> You need a single trajectory file.
>>
>>>
>>> Sorry for my ignorance on the matter.
>>>
>>> Thank you,
>>>
>>> Sanjeet
>>>
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>
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-- 
Christoph Junghans
Web: http://www.compphys.de

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