# pair_style none command

## Syntax

``` LAMMPS
pair_style none
```

## Examples

``` LAMMPS
pair_style none
```

## Description

Using a pair style of *none* means that any previous pair style setting
will be deleted and pairwise forces and energies are not computed.

As a consequence there will be a pairwise force cutoff of 0.0, which has
implications for the default setting of the neighbor list and the
communication cutoff. Those are the sum of the largest pairwise cutoff
and the neighbor skin distance (see the documentation of the
[neighbor](neighbor) command and the [comm_modify](comm_modify)
command). When you have bonds, angles, dihedrals, or impropers defined
at the same time, you must set the communication cutoff so that
communication cutoff distance is large enough to acquire and communicate
sufficient ghost atoms from neighboring subdomains as needed for
computing bonds, angles, etc.

A pair style of *none* will also not request a pairwise neighbor list.
However if the [neighbor](neighbor) style is *bin*, data structures for
binning are still allocated. If the neighbor list cutoff is small, then
these data structures can consume a large amount of memory. So you
should either set the neighbor style to *nsq* or set the skin distance
to a larger value.

See the [pair_style zero](pair_zero) for a way to set a pairwise cutoff
and thus trigger the building of a neighbor lists and setting a
corresponding communication cutoff, but compute no pairwise
interactions.

## Restrictions

You must not use a [pair_coeff](pair_coeff) command with this pair
style. Since there is no interaction computed, you cannot set any
coefficients for it.

## Related commands

[pair_style zero](pair_zero)

## Default

none