As Justin implied, -merge could potentially make a factor of 2. Try g_hbond -nomerge.

Erik

On Mar 4, 2013, at 4:02 PM, bipin singh wrote:

Thanks for the reply.
The difference is almost double, through g_hbond the average number of
contacts are 1821 and through g_mindist it is 3643. The calculation group
does not contains hydrogen atoms.


On Mon, Mar 4, 2013 at 8:14 PM, Justin Lemkul <jalem...@vt.edu> wrote:



On 3/4/13 9:08 AM, bipin singh wrote:

Hi All,

I have a doubt regarding the calculation of number of contacts between two groups. Because, I am getting different number of contacts calculated
through g_hbond -contact option and g_mindist -on option.
I have used same cutoff for distance (0.6nm) in both the cases.


How different are the results?  The g_hbond code is very complex, but
you'd probably have to go into the inner workings of both programs to
understand why. I also do not know whether other settings in g_hbond will matter, like -merge, or whether or not g_hbond will only calculate contacts
among H-bond participating groups.

-Justin

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