Hi Elaine,

Thank you so much for your reply. I made the axes by myself through “measure rotation”. It generated axes models. If “angle” command only show the smaller angle, why I got angle of minus and even more then 90 degree?

Thanks,

Jian

-----Original Message-----
From: Elaine Meng [mailto:meng@cgl.ucsf.edu]
Sent: 2014年9月23日 16:36
To: Jian Guan
Cc: chimera-users@cgl.ucsf.edu
Subject: Re: [Chimera-users] Angle

Hi Jian,

You would need to use the IDs of the axes (not model numbers) in the angle command.  The IDs are shown in the Axes/Planes/Centroids list of objects. You could have specified the IDs when you made the axes, or they would be generated automatically.

<http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/angle.html>

<http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/structuremeas/structuremeas.html#axes>

So the command would be something like:

angle a1 a2

It gives the smaller angle, treating both axes as infinite lines.

Elaine

On Sep 23, 2014, at 12:29 PM, "Jian Guan" <jug25@psu.edu> wrote:

> Hi All,

> I made two axes for two molecule, and want to measure the angle between them. Let's say, #1 and #2 are the two axes. I used command line of "angle #1 #2" to do that.

> Question:

> What is the default angle measurement? The #1 rotate clockwise or anti-clockwise to reach #2?

> Thanks,

> Jian