[gmx-users] g_angle between center of mass of three groups

[Mark Abraham]

jagannath mondal wrote:
> Hi,
> 
>   I know that g_dist gives the distance between the center of masses of  
> two groups.  But, I wanted to know whether it is possible to calculate 
> angle between center of masses of three groups or not . I am not sure 
> whether g_angle can calculate the angle between center of masses of 
> three groups.    If not, In that case,  can anyone suggest suggest any 
> other alternative ?

You should start by reading g_angle -h and g_sgangle -h. g_angle will 
calculate the average over a group of angles, which is similar to what 
you want.

Mark