Offset for frame ids in dcd trajectory

From: DimitryASuplatov (genesup_at_gmail.com)
Date: Sat May 23 2009 - 11:11:09 CDT

Hello,

I have a psf file, and a dcd trajectory.

1/ If I run

catdcd -num dcd

I have the following output

Read 2140 frames from file 1dwo.md.dcd.
Total frames: 2140

If I use catdcd to read frames from -first 0 to -last 0 I get null
output. To my understanding that means that frame numbering starts from
1.

2/ If I run vmd, load psf, then dcd, then run
set nf [ molinfo top get numframes]

I get

nf=2140, but I cat start selecting frames from 0, that is
set frame0 [atomselect top "protein and backbone and noh" frame 0] -
shall work

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Question:

How could you explain an extra frame in dcd trajectory when using vmd?

Thank you for your time.

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