# fix_modify AtC control localized_lambda command

## Syntax

    fix_modify <AtC fixID> control localized_lambda <on|off>

-   AtC fixID = ID of [fix atc](fix_atc) instance
-   control localized_lambda = name of the AtC sub-command
-   *on* or *off* = Toggles state of localization algorithm

## Examples

``` LAMMPS
fix_modify AtC control localized_lambda on
```

## Description

Turns the localization algorithms *on* or *off* for control algorithms
to restrict the influence of FE coupling or boundary conditions to a
region near the boundary of the MD region. Control algorithms will not
affect atoms in elements not possessing faces on the boundary of the
region. Flux-based control is localized via row-sum lumping while
quantity control is done by solving a truncated matrix equation.

## Restrictions

None.

## Related AtC commands

-   [fix_modify AtC command overview](atc_fix_modify)

## Default

off