From: Josh Vermaas (
Date: Tue Jan 21 2014 - 16:16:13 CST

Hi Steven,

If you really want every sixth atom, that part is actually not too bad.
Your atom selection would be "serial % 6 == 0", which would return a
selection containing every 6th atom in a file. However, I don't think
this is what you meant, as that would in no way be equivalent to "serial
1 to 6". Can you describe better what you are trying to accomplish?

-Josh Vermaas

On 01/21/2014 03:01 PM, Steven Neumann wrote:
> Dear Users,
> Would you please recommend any script which once read the pdb file
> will save e.g. every 6th atom in a separate file? using atomselect
> serial 1 to 6 or serial 12 to 18 etc. is not helps as I have over 400
> K atoms :(
> Please advise,
> Steven