Hello!
Check out
http://wiki.gromacs.org/index.php/Errors#Stepsize_too_small.
2C_or_no_change_in_energy._Converged_to_machine_precision.
2C_but_not_to_the_requested_precision
Cheers
/Per
17 aug 2007 kl. 18.28 skrev Sheyore Omovie:
Dear gmx-users,
I have 2 molecules in a box, as usual pdb2gmx saw them as one. i
edited the .top file to remove the bonds created between the two
molecules, I also added a distance restraint btw the molecules.
(The 2 structures have been separately minimized). However, I get
the ff message for EM run:
Stepsize too small, or no change in energy.
Converged to machine precision,
but not to the requested precision Fmax < 1000
Double precision normally gives you higher accuracy.
Steepest Descents converged to machine precision in 15 steps,
but did not reach the requested Fmax < 1000.
Potential Energy = 1.0246325e+20
Maximum force = inf on atom 1
Norm of force = inf
I would appreciate any advice on how to fix this.
Rgds
John
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