On 13 Aug 2013, at 11:21, [email protected] wrote:

> I used different software ACEMD driving my protein from 300K to 500K 
> thousands of times to explore or possible conformations...so the box 
> dimension was changing from 9.4 to 11.4 nm. At 300K it had 9.4 nm. I used all 
> the states corresponding to 300K only. No I will change the box in my CG 
> iterative method to 9.4 nm as I had 12 nm no clue why... Should work fine 
> now. Thank you!

May be some inconsistence with trajectory reading. 
Never used AceMD.
V

> 
> W dniu wtorek, 13 sierpnia 2013 11:08:21 UTC+1 użytkownik Valentina Erastova 
> napisał:
> So, you started with cubic box of 95A * 3  (gromacs units are nm)? Then you T 
> annealed, got output confout.gro (with box size at the bottom of the file), 
> change of the box size can be taken from trajectory.
> 
> I am not too sure about your method, tbh, as annealing is a funny thing - it 
> can cause system to lag behind. Personally, I wouldn't use a system that 
> potentially can not have reached equilibrium to get reference potentials for 
> CG.
> 
> .tpr is binary, i.e. you cannot read it.
> 
> csg_stat - I am not sure, better ask developers, but I would expect it to 
> come from the trajectory.
> 
> V
> 
> 
> 
> On 13 Aug 2013, at 10:56, [email protected] wrote:
> 
>> Sorry, my cell dimension was 95A (I was running temperature annealing so the 
>> box dimension changed). Where in tpr file can I see the actual cell 
>> dimension? I mean from where csg_stat takes the cell dimension to calculate 
>> RDFs?
>> 
>> Steven
>> 
>> W dniu wtorek, 13 sierpnia 2013 10:49:13 UTC+1 użytkownik Valentina Erastova 
>> napisał:
>> Hi,
>> 
>> I am a little confused there.
>> 
>> You need to have a well equilibrated system before you CG. My way is to run 
>> NPT, but make sure that the system is equilibrated and V is also constant.
>> 
>> When you start CG, I would use NVT, check what is the P (normally completely 
>> off), then do a P-correction.
>> 
>> Good luck, V
>> 
>> 
>> On 13 Aug 2013, at 10:37, <[email protected]>
>>  wrote:
>> 
>>> I think I know where is the reason... I set the wrong unit cell in my CG 
>>> model. However, I run full atomistic in NPT and the cubic unit cell was 
>>> changing between 94A and 114A. Which shall I set up in my CG run then which 
>>> is in NVT? 
>>> 
>>> W dniu poniedziałek, 12 sierpnia 2013 17:02:36 UTC+1 użytkownik Valentina 
>>> Erastova napisał:
>>> Hi, have you used scaling by by 1 /4 \pi r^2for bond  and  by 1/ sin 
>>> (\theta) for angle distribution?
>>> 
>>> I assume those are angles & bonds.
>>> 
>>> Best,
>>> V
>>> 
>>> 
>>> 
>>> On 12 Aug 2013, at 16:39, [email protected] wrote:
>>> 
>>>> Dear Users,
>>>> 
>>>> I run 7500 iterations of the protein with 5 different bead types so 15 
>>>> distributions. Please, see attached 4 examples - black atomistic, red 
>>>> coarse-grained.
>>>> 14 of them have exactly the same shapes as atomistic but have higher 
>>>> values and they stopped converging after 6000 steps. Only one (attached) 
>>>> perfectly converged.
>>>> May that be the reason of the one converged so its a wrong distribution so 
>>>> the other cannot? Or everything is ok and I just to normalize them?
>>>> 
>>>> Thank you,
>>>> 
>>>> Steven
>>>> 
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