# fix temp/rescale/eff command

## Syntax

    fix ID group-ID temp/rescale/eff N Tstart Tstop window fraction

-   ID, group-ID are documented in [fix](fix) command
-   temp/rescale/eff = style name of this fix command
-   N = perform rescaling every N steps
-   Tstart,Tstop = desired temperature at start/end of run (temperature
    units)
-   window = only rescale if temperature is outside this window
    (temperature units)
-   fraction = rescale to target temperature by this fraction

## Examples

``` LAMMPS
fix 3 flow temp/rescale/eff 10 1.0 100.0 0.02 1.0
```

## Description

Reset the temperature of a group of nuclei and electrons in the
[electron force field](pair_eff) model by explicitly rescaling their
velocities.

The operation of this fix is exactly like that described by the [fix
temp/rescale](fix_temp_rescale) command, except that the rescaling is
also applied to the radial electron velocity for electron particles.

## Restart, fix_modify, output, run start/stop, minimize info

No information about this fix is written to [binary restart
files](restart).

The [fix_modify](fix_modify) *temp* option is supported by this fix. You
can use it to assign a temperature [compute](compute) you have defined
to this fix which will be used in its thermostatting procedure, as
described above. For consistency, the group used by this fix and by the
compute should be the same.

The cumulative energy change in the system imposed by this fix is
included in the [thermodynamic output](thermo_style) keywords *ecouple*
and *econserve*. See the [thermo_style](thermo_style) doc page for
details.

This fix computes a global scalar which can be accessed by various
[output commands](Howto_output). The scalar is the same cumulative
energy change due to this fix described in the previous paragraph. The
scalar value calculated by this fix is \"extensive\".

This fix can ramp its target temperature over multiple runs, using the
*start* and *stop* keywords of the [run](run) command. See the
[run](run) command for details of how to do this.

This fix is not invoked during [energy minimization](minimize).

## Restrictions

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

## Related commands

[fix langevin/eff](fix_langevin_eff), [fix nvt/eff](fix_nh_eff),
[fix_modify](fix_modify), [fix temp rescale](fix_temp_rescale),

## Default

none