[gmx-users] restart

[Yujie Wu]

Hi,

I am wondering why in gromacs a restarted MD simulation will not reproduce the
trajectory by a continuous one.

The test I did was to run a 4-step MD and got the final .gro file. Then ran a
2-step MD, generating the tpr using "tpbconv -s -f -e -extend", then ran it and
got the final .gro file. A diff of the two .gro files tells me that they are
different even in the third decimal place. The `nstxout', `nstvout', `nstfout',
and `nstenergy' variables were set to 1. The Gromacs version is 3.3 (single
precision).

Any idea where and what the problem is? Thanks in advance.

Yujie