Re: AMBER: trouble adding mdcrd files together

From: Carlos Simmerling <>
Date: Fri, 02 Jun 2006 18:37:54 -0400

any chance that you're not using the right prmtop file?
is the new file the right size in terms of bytes (sum of the other 2)?
this should work just fine...

Adam Pelzer wrote:

> Dear AMBER users,
> I have run into trouble using ptraj to add two mdcrd files together.
> My input file was simply this:
> trajin no_salt_prod.mdcrd
> trajin no_salt_prod2.mdcrd
> trajout no_salt_prod1500.mdcrd
> no_salt_prod.mdcrd has 250 frames, and no_salt_prod2.mdcrd has 500
> frames. Both of these files had been previously read into both VMD and
> ptraj without problems. When I submitted this input file to ptraj,
> everything seemed to go smoothly, with ptraj recognizing all of the
> frames of each mdcrd file. However, when I tried to use
> no_salt_prod1500.mdcrd (which should have had 750 frames) as a
> "trajin" file, I was told by ptraj that the file had only 598 frames.
> I read it into VMD and VMD also found only 598 frames.
> Does anyone know what may have gone wrong here? I would be very
> grateful for any suggestions. Thank you in advance.
> Adam
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Received on Sun Jun 04 2006 - 06:07:17 PDT
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