# fix_modify AtC output command

## Syntax

    fix_modify <AtC fixID> output <filename_prefix> <frequency> [text|full_text|binary|vector_components|tensor_components]
    fix_modify <AtC fixID> output index [step|time]

-   AtC fixID = ID of [fix atc](fix_atc) instance
-   *output* or *output index* = name of the AtC sub-command
-   filename_prefix = prefix for data files (for *output*)
-   frequency = frequency of output in timesteps (for *output*)
-   optional keywords for *output*:
    -   text = creates text output of index, step and nodal variable
        values for unique nodes
    -   full_text = creates text output index, nodal id, step, nodal
        coordinates and nodal variable values for unique and image nodes
    -   binary = creates binary EnSight output
    -   vector_components = outputs vectors as scalar components
    -   tensor_components = outputs tensor as scalar components (for use
        with ParaView)
-   *step* or *time* = index output by step or by time (for *output
    index*)

## Examples

``` LAMMPS
fix_modify AtC output heatFE 100
fix_modify AtC output hardyFE 1 text tensor_components
fix_modify AtC output hardyFE 10 text binary tensor_components
fix_modify AtC output index step
```

## Description

Creates text and/or binary (EnSight, \"gold\" format) output of
nodal/mesh data which is transfer/physics specific. Output indexing by
step or time is possible.

## Restrictions

None.

## Related AtC commands

-   [fix_modify AtC command overview](atc_fix_modify)
-   [fix atc command](fix_atc)

## Default

No default format. Output indexed by time.