# compute dpd/atom command

## Syntax

``` LAMMPS
compute ID group-ID dpd/atom
```

-   ID, group-ID are documented in [compute](compute) command
-   dpd/atom = style name of this compute command

## Examples

``` LAMMPS
compute 1 all dpd/atom
```

## Description

Define a computation that accesses the per-particle internal conductive
energy ($u^\text{cond}$), internal mechanical energy ($u^\text{mech}$),
internal chemical energy ($u^\text{chem}$) and internal temperatures
($\theta$) for each particle in a group. See the [compute
dpd](compute_dpd) command if you want the total internal conductive
energy, the total internal mechanical energy, the total chemical energy
and average internal temperature of the entire system or group of dpd
particles.

## Output info

This compute calculates a per-particle array with four columns
($u^\text{cond}$, $u^\text{mech}$, $u^\text{chem}$, $\theta$), which can
be accessed by indices 1\--4 by any command that uses per-particle
values from a compute as input. See the [Howto output](Howto_output)
page for an overview of LAMMPS output options.

The per-particle array values will be in energy ($u^\text{cond}$,
$u^\text{mech}$, $u^\text{chem}$) and temperature ($\theta$)
[units](units).

## Restrictions

This command is part of the DPD-REACT package. It is only enabled if
LAMMPS was built with that package. See the [Build
package](Build_package) page for more info.

This command also requires use of the [atom_style dpd](atom_style)
command.

## Related commands

[dump custom](dump), [compute dpd](compute_dpd)

## Default

none

------------------------------------------------------------------------

::: {#Larentzos2}
**(Larentzos)** J.P. Larentzos, J.K. Brennan, J.D. Moore, and W.D.
Mattson, \"LAMMPS Implementation of Constant Energy Dissipative Particle
Dynamics (DPD-E)\", ARL-TR-6863, U.S. Army Research Laboratory, Aberdeen
Proving Ground, MD (2014).
:::