---
name: "ngmx"
section: "1"
platform: "linux"
package: "gromacs-data"
version: "4.5.5-2"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/ngmx"
---

# ngmx(1)

displays a trajectory VERSION 4.5.4-dev-20110404-bc5695c

## NAME

ngmx - displays a trajectory

**VERSION 4.5.4-dev-20110404-bc5695c**

## SYNOPSIS

**ngmx** **-f** *traj.xtc*  **-s** *topol.tpr*  **-n** *index.ndx*  **-\[no\]h** **-\[no\]version** **-nice** *int*  **-b** *time*  **-e** *time*  **-dt** *time*

## DESCRIPTION

 **ngmx** is the GROMACS trajectory viewer. This program reads a trajectory file, a run input file and an index file and plots a 3D structure of your molecule on your standard X Window screen. No need for a high end graphics workstation, it even works on Monochrome screens.

The following features have been implemented: 3D view, rotation, translation and scaling of your molecule(s), labels on atoms, animation of trajectories, hardcopy in PostScript format, user defined atom-filters runs on MIT-X (real X), open windows and motif, user friendly menus, option to remove periodicity, option to show computational box.

Some of the more common X command line options can be used:   **-bg**,  **-fg** change colors,  **-font fontname** changes the font.

## FILES

**-f** *traj.xtc* **Input**\
  Trajectory: xtc trr trj gro g96 pdb cpt

**-s** *topol.tpr* **Input**\
  Run input file: tpr tpb tpa

**-n** *index.ndx* **Input, Opt.**\
  Index file

## OTHER OPTIONS

**-\[no\]h***no*    \
  Print help info and quit

**-\[no\]version***no*    \
  Print version info and quit

**-nice** *int* **0**\
  Set the nicelevel

**-b** *time* **0**     \
  First frame (ps) to read from trajectory

**-e** *time* **0**     \
  Last frame (ps) to read from trajectory

**-dt** *time* **0**     \
  Only use frame when t MOD dt = first time (ps)

## KNOWN PROBLEMS

\- Balls option does not work

\- Some times dumps core without a good reason

## SEE ALSO

**[gromacs(7)](/gromacs/7.md)**

More information about **GROMACS** is available at \<*http://www.gromacs.org/*\>.