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# 5. Coordinates modules

The coordinates module contains the classes to read and write trajectories. Typically, MDAnalysis recognizes Table of Supported coordinate formats by the file extension and hence most users probably do not need to concern themselves with classes and functions described here. However, if MDAnalysis fails to recognize a coordinate file then the user can provide the format in the keyword argument format to `Universe` to force the format.

Programmers and anyone trying to implement new functionality should read the Trajectory API (described in `MDAnalysis.coordinates`).

Contents

- 5.1. Coordinate/Trajectory Readers and Writers — `MDAnalysis.coordinates`
- 5.2. Base classes — `MDAnalysis.coordinates.base`
- 5.3. Common functions for coordinate reading — `MDAnalysis.coordinates.core`
- 5.4. CRD structure files in MDAnalysis — `MDAnalysis.coordinates.CRD`
- 5.5. DCD trajectory I/O — `MDAnalysis.coordinates.DCD`
- 5.6. LAMMPS DCD trajectory I/O — `MDAnalysis.coordinates.LAMMPS`
- 5.7. GRO file format — `MDAnalysis.coordinates.GRO`
- 5.8. PDB structure files in MDAnalysis — `MDAnalysis.coordinates.PDB`
- 5.9. PDBQT structure files in MDAnalysis — `MDAnalysis.coordinates.PDBQT`
- 5.10. PQR file format — `MDAnalysis.coordinates.PQR`
- 5.11. AMBER trajectories — `MDAnalysis.coordinates.TRJ`
- 5.12. Gromacs TRR file IO — `MDAnalysis.coordinates.TRR`
- 5.13. Gromacs XTC file IO — `MDAnalysis.coordinates.XTC`
- 5.14. XYZ trajectory reader — `MDAnalysis.coordinates.XYZ`
- 5.15. `pdb.extensions` – Extensions to `Bio.PDB`
- 5.16. The Gromacs xtc/trr library `libxdrfile`

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