fix_modify AtC kernel command — LAMMPS documentation

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# fix_modify AtC kernel command

## Syntax

    fix_modify <AtC fixID> kernel <type> <parameters>

- AtC fixID = ID of fix atc instance

- kernel = name of the AtC sub-command

- type = step or cell or cubic_bar or cubic_cylinder or cubic_sphere or quartic_bar or quartic_cylinder or quartic_sphere

- the following parameter(s) are required for each kernel:

  - step : <radius>

  - cell : <hx> <hy> <hz> or <h>

  - cubic_bar : <half_width>

  - cubic_cylinder : <radius>

  - cubic_sphere : <radius>

  - quartic_bar : <half_width>

  - quartic_cylinder : <radius>

  - quartic_sphere : <radius>

## Examples

    fix_modify AtC kernel cell 1.0 1.0 1.0
    fix_modify AtC kernel quartic_sphere 10.0

## Description

Sets the localization kernel type and parameters for fix atc hardy.

## Restrictions

Must be used with fix atc hardy. For bar kernel types, half-width oriented along x-direction. For cylinder kernel types, cylindrical axis is assumed to be in z-direction.

## Related AtC commands

- fix_modify AtC command overview

- fix_modify AtC fields

- fix_modify AtC gradients

- fix_modify AtC rates

- fix_modify AtC computes

## Default

None.