# partition command

## Syntax

    partition style N command ...

-   style = *yes* or *no*
-   N = partition number (see asterisk form below)
-   command = any LAMMPS command

## Examples

``` LAMMPS
partition yes 1 processors 4 10 6
partition no 5 print "Active partition"
partition yes *5 fix all nve
partition yes 6* fix all nvt temp 1.0 1.0 0.1
```

## Description

This command invokes the specified command on a subset of the partitions
of processors you have defined via the [-partition command-line
switch](Run_options).

Normally, every input script command in your script is invoked by every
partition. This behavior can be modified by defining world- or
universe-style [variables](variable) that have different values for each
partition. This mechanism can be used to cause your script to jump to
different input script files on different partitions, if such a variable
is used in a [jump](jump) command.

The \"partition\" command is another mechanism for having as input
script operate differently on different partitions. It is basically a
prefix on any LAMMPS command. The command will only be invoked on the
partition(s) specified by the *style* and *N* arguments.

If the *style* is *yes*, the command will be invoked on any partition
which matches the *N* argument. If the *style* is *no* the command will
be invoked on all the partitions which do not match the Np argument.

Partitions are numbered from 1 to Np, where Np is the number of
partitions specified by the [-partition command-line
switch](Run_options).

*N* can be specified in one of two ways. An explicit numeric value can
be used, as in the first example above. Or a wild-card asterisk can be
used to span a range of partition numbers. This takes the form \"\*\" or
\"\*n\" or \"n\*\" or \"m\*n\". An asterisk with no numeric values means
all partitions from 1 to Np. A leading asterisk means all partitions
from 1 to n (inclusive). A trailing asterisk means all partitions from n
to Np (inclusive). A middle asterisk means all partitions from m to n
(inclusive).

This command can be useful for the \"run_style verlet/split\" command
which imposed requirements on how the [processors](processors) command
lays out a 3d grid of processors in each of 2 partitions.

## Restrictions

> none

## Related commands

[run_style verlet/split](run_style)

## Default

none