[lammps-users] fix addforce issues

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1

Hello,

I am using the latest version of LAMMPS (11-May10) and am having troubles with the fix addforce command.

My syntax is as follows:

fix A_field A addforce 0.0 0.0 0.3

This is essentially the same as the example syntax provided for the “fix addforce” command so I think I may be encountering a bug.

The error message I am receiving is:

ERROR: Cannot use variable energy with constant force in fix addforce

(I could not find any information on this in the LAMMPS errors section.)

Please let me know where I am going wrong or if more information is required for help on this issue.

Thanks as always,

Brian

2

brian,

this is a bit of a wild guess, but try changing in line 75 of fix_addforce.cpp
the line

evar=NONE;

to

estyle=NONE;

recompile and run again.

if i read the code right, this should cure your problem.

cheers,
     axel.

3

That did the trick. Thanks.

-B

4

yes - this was a bug - posted a patch - thanks

Steve