Editing Elbow angle (section)

== Examples ==
===Basic usage===
<syntaxhighlight lang="python">
# load an antibody Fab fragment from the PDB
fetch 3ghe, async=0
# calculate the elbow angle and draw the vectors
elbow_angle 3ghe, draw=1
</syntaxhighlight>
This will produce something like the first image below.

Note that if you don't specify the light/heavy chain IDs or the variable domain limit residue numbers, the default values (L/H and 107/113, respectively) will be used.  If your antibody is not Kabat or Chothia numbered, or has different chain names, this will result in an incorrect value or, in the case of wrong chain IDs, may cause the script to fail entirely due to an empty selection.  Have a look at Dr. Andrew Martin's [http://www.bioinf.org.uk/abs/abnum/ Abnum] for more information on antibody numbering.

<gallery heights="320" widths="320">
Image:elbow_angle_3ghe.png|Fab fragment 3ghe shown with draw=1.
Image:Stanfield.png|5 PDB examples from Stanfield, et al., JMB 2006, shown in the same orientations as in Figure 1 of that paper.
</gallery>
The black "dumbbells" pass through the centers of mass of the variable and constant domains of each Fab (as determined using [[com|com.py]]). The green and red dumbbells denote the residues used to split the variable and constant domains, with a green ball for the light chain, and a red ball for the heavy chain.

===Included Example===
There is also an example .pml file in the Pymol-script-repo/examples directory which can be run by the following:
<syntaxhighlight lang="python">
import ex
ex elbow_angle
</syntaxhighlight>

This will run the following .pml file:
{{Infobox script-repo
|type      = pml
|filename  = examples/elbow_angle.pml
|author    = [[User:jaredsampson|Jared Sampson]]
|license   = BSD
}}
<include src="https://raw.github.com/Pymol-Scripts/Pymol-script-repo/master/examples/elbow_angle.pml" highlight="python" />

and will produce the second image above.