# fix_modify AtC write_atom_weights command

## Syntax

    fix_modify <AtC fixID> write_atom_weights <filename> <frequency>

-   AtC fixID = ID of [fix atc](fix_atc) instance
-   write_atom_weights = name of the AtC sub-command
-   filename = name of file that atomic weights are written to
-   frequency = how often writes will occur

## Examples

``` LAMMPS
fix_modify AtC write_atom_weights atm_wt_file.txt 10
```

## Description

Command for writing the values of atomic weights to a specified file.

## Restrictions

None.

## Related AtC commands

-   [fix_modify AtC command overview](atc_fix_modify)

## Default

None