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<HTML>
<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
</CENTER>
<HR>
<H3>fix_modify command
</H3>
<P><B>Syntax:</B>
</P>
<PRE>fix_modify fix-ID keyword value ...
</PRE>
<UL><LI>fix-ID = ID of the fix to modify
<LI>one or more keyword/value pairs may be appended
<LI>keyword = <I>temp</I> or <I>energy</I> or <I>thermo</I>
<PRE> <I>temp</I> value = temperature ID
<I>energy</I> value = <I>yes</I> or <I>no</I>
<I>thermo</I> value = <I>yes</I> or <I>no</I>
</PRE>
</UL>
<P><B>Examples:</B>
</P>
<PRE>fix_modify 3 temp myTemp
fix_modify 1 thermo yes energy no
</PRE>
<P><B>Description:</B>
</P>
<P>Modify one or more parameters of a previously defined fix. Not all
fix styles support all parameters.
</P>
<P>The <I>temp</I> keyword is used to determine how a fix computes
temperature. The specified temperature ID must have been previously
defined by the user via the <A HREF = "temperature.html">temperature</A> command.
The default setting for <I>temp</I> is temperature ID = <I>default</I>. Fix
styles that use the <I>temp</I> setting are
<A HREF = "fix_temp_rescale.html">temp/rescale</A>, <A HREF = "fix_nvt.html">nvt</A>, and
<A HREF = "fix_npt.html">npt</A>.
</P>
<P>The <I>energy</I> and <I>thermo</I> keywords enable a fix to compute and/or
print quantities as part of the thermodynamic output to the screen and
log file (if the fix defines such quantites). When the <I>energy</I>
keyword is set to <I>yes</I>, the fix computes a contribution to the total
potential energy that is printed as PotEng during thermodynamic
output. When the <I>thermo</I> keyword is set to yes, the fix prints one
or more values that are appended to the list of thermodynamic outputs.
See the <A HREF = "thermo_style.html">thermo_style</A> command for how this printing
is formatted.
</P>
<P>The fixes that support the <I>energy</I> and <I>thermo</I> options include: <A HREF = "fix_indent.html">fix
indent</A>, <A HREF = "fix_nvt.html">fix nvt</A>, <A HREF = "fix_nph.html">fix
nph</A>, <A HREF = "fix_npt.html">fix npt</A>, <A HREF = "fix_orient_fcc.html">fix
orient/fcc</A>, <A HREF = "fix_temp_rescale.html">fix
temp/rescale</A>, and <A HREF = "fix_wall_lj93.html">fix
wall/lj93</A>. See the individual fix commands for
more info on what is computed and/or printed.
</P>
<P><B>Restrictions:</B> none
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "fix.html">fix</A>, <A HREF = "temperature.html">temperature</A>,
<A HREF = "thermo_style.html">thermo_style</A>
</P>
<P><B>Default:</B>
</P>
<P>The option defaults are temp = default, energy = no, thermo = no.
</P>
</HTML>