[gmx-users] g_tune_pme in Ranger

2009-06-30 Thread Patricia Soto
Hi,
I wonder whether somebody has been able to install g_tune_pme in Ranger (one
of the tacc clusters). If so, please contact me off list as I have a couple
of questions to ask.

Patricia.

-- 
Dr. Patricia Soto
patricia.sot...@gmail.com
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[gmx-users] Re: HB lifetime in g_hbond

2007-06-14 Thread Patricia Soto Becerra



I have a question regarding the calculation of hydrogen bond lifetimes
in g_hbond:

Line 1094 of gmx_hbond.c v 1.16.2.11 2006/04/02 (which is equivalent to
line 1121 of gmx_hbond.c v 1.28 2006/08/30) reads:

t  = hb-time[i] - hb-time[0] - 0.5*dt;

leading to the time series 1, 3, 5,.. that does not correspond to my
sampling frequency of 2ps. This affects the calculation of x1 in the
immediate next line. My question is: Why is t defined in this way?


The program computes an histogram and centers the points in between time
points. Note that this flag gives you useless lifetimes, see J. Phys.
Chem. B 110 pp. 4393-4398 (2006). You want to use the lifetime that
comes from the -ac option (look at line with Forward)



Yes, I had indeed noticed that the value reported by this flag was far 
from my own calculations so I wanted to make sure I was understanding what 
g_hbond was doing.  Thanks. (of course, I already read your paper in JPC 
B.)


Patricia
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[gmx-users] HB lifetime in g_hbond

2007-06-13 Thread Patricia Soto Becerra

Hi,
I have a question regarding the calculation of hydrogen bond lifetimes in 
g_hbond:


Line 1094 of gmx_hbond.c v 1.16.2.11 2006/04/02 (which is equivalent to 
line 1121 of gmx_hbond.c v 1.28 2006/08/30) reads:


t  = hb-time[i] - hb-time[0] - 0.5*dt;

leading to the time series 1, 3, 5,.. that does not correspond to my 
sampling frequency of 2ps. This affects the calculation of x1 in the 
immediate next line. My question is: Why is t defined in this way?


This question was posted in the past but did not find answer in the users 
list.


Thanks!

Patricia
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