# Removed commands and packages

This page lists LAMMPS commands and packages that have been removed from
the distribution and provides suggestions for alternatives or
replacements. LAMMPS has special dummy styles implemented, that will
stop LAMMPS and print a suitable error message in most cases, when a
style/command is used that has been removed or will replace the command
with the direct alternative (if available) and print a warning.

## Fix ave/spatial and fix ave/spatial/sphere

::: deprecated
11Dec2015
:::

The fixes ave/spatial and ave/spatial/sphere have been removed from
LAMMPS since they were superseded by the more general and extensible
\"chunk infrastructure\". Here the system is partitioned in one of many
possible ways through the [compute chunk/atom](compute_chunk_atom)
command and then averaging is done using [fix ave/chunk](fix_ave_chunk).
Please refer to the [chunk HOWTO](Howto_chunk) section for an overview.

## Box command

::: deprecated
22Dec2022
:::

The *box* command has been removed and the LAMMPS code changed so it
won\'t be needed. If present, LAMMPS will ignore the command and print a
warning.

## Reset_ids, reset_atom_ids, reset_mol_ids commands

::: deprecated
22Dec2022
:::

The *reset_ids*, *reset_atom_ids*, and *reset_mol_ids* commands have
been folded into the [reset_atoms](reset_atoms) command. If present,
LAMMPS will replace the commands accordingly and print a warning.

## LATTE package

::: deprecated
15Jun2023
:::

The LATTE package with the fix latte command was removed from LAMMPS.
This functionality has been superseded by [fix mdi/qm](fix_mdi_qm) and
[fix mdi/qmmm](fix_mdi_qmmm) from the [MDI package](PKG-MDI). These
fixes are compatible with several quantum software packages, including
LATTE. See the `examples/QUANTUM` dir and the [MDI coupling
HOWTO](Howto_mdi) page. MDI supports running LAMMPS with LATTE as a
plugin library (similar to the way fix latte worked), as well as on a
different set of MPI processors.

## MEAM package

The MEAM package in Fortran has been replaced by a C++ implementation.
The code in the [MEAM package](PKG-MEAM) is a translation of the Fortran
code of MEAM into C++, which removes several restrictions (e.g. there
can be multiple instances in hybrid pair styles) and allows for some
optimizations leading to better performance. The pair style
[meam](pair_meam) has the exact same syntax. For a transition period the
C++ version of MEAM was called USER-MEAMC so it could coexist with the
Fortran version.

## Minimize style fire/old

::: deprecated
8Feb2023
:::

Minimize style *fire/old* has been removed. Its functionality can be
reproduced with *fire* with specific options. Please see the [min_modify
command](min_modify) documentation for details.

## Pair style mesont/tpm, compute style mesont, atom style mesont

::: deprecated
8Feb2023
:::

Pair style *mesont/tpm*, compute style *mesont*, and atom style *mesont*
have been removed from the [MESONT package](PKG-MESONT). The same
functionality is available through [pair style mesocnt](pair_mesocnt),
[bond style mesocnt](bond_mesocnt) and [angle style
mesocnt](angle_mesocnt).

## REAX package

The REAX package has been removed since it was superseded by the [REAXFF
package](PKG-REAXFF). The REAXFF package has been tested to yield
equivalent results to the REAX package, offers better performance,
supports OpenMP multi-threading via OPENMP, and GPU and threading
parallelization through KOKKOS. The new pair styles are not syntax
compatible with the removed reax pair style, so input files will have to
be adapted. The REAXFF package was originally called USER-REAXC.

## USER-CUDA package

The USER-CUDA package had been removed, since it had been unmaintained
for a long time and had known bugs and problems. Significant parts of
the design were transferred to the [KOKKOS package](PKG-KOKKOS), which
has similar performance characteristics on NVIDIA GPUs. Both, the KOKKOS
and the [GPU package](PKG-GPU) are maintained and allow running LAMMPS
with GPU acceleration.

## restart2data tool

The functionality of the restart2data tool has been folded into the
LAMMPS executable directly instead of having a separate tool. A
combination of the commands [read_restart](read_restart) and
[write_data](write_data) can be used to the same effect. For added
convenience this conversion can also be triggered by [command line
flags](Run_options)