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Centroid: Difference between revisions

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What this script is actually computing is the centroid not the center of mass. The center of mass is the mass-weighted average of the coordinates.
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{{Infobox script-repo
{{Infobox script-repo
|type      = module
|type      = module
|filename  = com.py
|filename  = centroid.py
|author    = [[User:Inchoate|Jason Vertrees]]
|author    = [[User:Inchoate|Jason Vertrees]]
|license  = BSD
|license  = BSD
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== Overview ==  
== Overview ==  
[[COM]] is a small script that returns the value of the center of mass of your selection.  It also can translate the object of that selection to the origin.
Centroid is a small script that returns the value of the geometric center (or centroid) of your selection.  It also can translate the object of that selection to the origin.


== Syntax ==
== Syntax ==
<source lang="python">
<source lang="python">
COM (selection=PyMOLSelection), [center=boolean]
centroid (selection=PyMOLSelection), [center=boolean]
</source>
</source>


== Examples ==
== Examples ==
<source lang="python">
<source lang="python">
# get the COM of the polymer
# get the centroid of the polymer
import com
import centroid
fetch 4ins, async=0
fetch 4ins, async=0
COM polymer
centroid polymer


# move some 'ligand' to the origin
# move some 'ligand' to the origin
COM ligand, center=1
centroid ligand, center=1
</source>
</source>



Revision as of 22:54, 14 September 2015

Type Python Module
Download centroid.py
Author(s) Jason Vertrees
License BSD
This code has been put under version control in the project Pymol-script-repo

Overview

Centroid is a small script that returns the value of the geometric center (or centroid) of your selection. It also can translate the object of that selection to the origin.

Syntax

centroid (selection=PyMOLSelection), [center=boolean]

Examples

# get the centroid of the polymer
import centroid
fetch 4ins, async=0
centroid polymer

# move some 'ligand' to the origin
centroid ligand, center=1

See Also

Center_Of_Mass