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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13645 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp
2015-07-18 00:08:17 +00:00
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22
doc/atom_modify.html
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@ -46,16 +46,18 @@ simulation box is defined; other keywords can be specified any time.
to each atom. If the value is <I>yes</I>, which is the default, IDs are
assigned, whether you use the <A HREF = "create_atoms.html">create atoms</A> or
<A HREF = "read_data.html">read_data</A> or <A HREF = "read_restart.html">read_restart</A>
commands to initialize atoms. If atom IDs are used, they must all be
positive integers. They should also be unique, though LAMMPS does not
check for this. Typically they should also be consecutively numbered
(from 1 to Natoms), though this is not required. Molecular <A HREF = "atom_style.html">atom
styles</A> are those that store bond topology information
(styles bond, angle, molecular, full). These styles require atom IDs
since the IDs are used to encode the topology. Some other LAMMPS
commands also require the use of atom IDs. E.g. some many-body pair
styles use them to avoid double computation of the I-J interaction
between two atoms.
commands to initialize atoms. If the value is <I>no</I> the IDs for all
atoms are assumed to be 0.
</P>
<P>If atom IDs are used, they must all be positive integers. They should
also be unique, though LAMMPS does not check for this. Typically they
should also be consecutively numbered (from 1 to Natoms), though this
is not required. Molecular <A HREF = "atom_style.html">atom styles</A> are those
that store bond topology information (styles bond, angle, molecular,
full). These styles require atom IDs since the IDs are used to encode
the topology. Some other LAMMPS commands also require the use of atom
IDs. E.g. some many-body pair styles use them to avoid double
computation of the I-J interaction between two atoms.
</P>
<P>The only reason not to use atom IDs is if you are running an atomic
simulation so large that IDs cannot be uniquely assigned. For a