On 7/27/12 1:02 PM, yousef nademi wrote:
thank you for responding
but i want the figure probability versus P-N vector angle and g_sgangle dont 
give this output .just g_angle give this output


g_analyze -distr produces distributions from any .xvg file, otherwise it is fairly straightforward to write a simple histogram program.

-Justin


----- Original Message -----
From: Justin Lemkul <jalem...@vt.edu>
To: yousef nademi <yousef_nad...@yahoo.com>; Discussion list for GROMACS users 
<gmx-users@gromacs.org>
Cc:
Sent: Friday, July 27, 2012 9:57 AM
Subject: Re: [gmx-users] p_N head group lipid orientation



On 7/27/12 12:50 PM, yousef nademi wrote:

​hi everybody
i want to calculate the P_N orientation of dppc lipid bilayer but in g_angle 
index file shoud have at least 3 atom but in P_N vector i want to define 2 atom
is there anyone know what should i do?


g_sgangle with the -z option (assuming the bilayer is in the x-y plane) should 
do this.  The index group can contain two atoms (or a suitable multiple of two 
defining all the P and N atoms).

-Justin

-- ========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

========================================


--
========================================

Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

========================================
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