DPUSER - The Next Generation
Author: Thomas Ott

# Introduction

DPUSER is an interactive language that is capable of handling numbers (both real and complex), strings, and matrices. Its main aim is to do astronomical image analysis, for which it provides a comprehensive set of functions, but it can also be used for many other applications.
QFitsView is a FITS file viewer. In addition to displaying two-dimensional images, it also provides means to explore three-dimensional data cubes.

### List of available documentation

The DPUSER Language | Command Reference | QFitsView
--- | --- | ---
Command Syntax | Alphabetical function list | GUI elements
Operators | Alphabetical procedure list |
Data types and variables | Alphabetical list of pgplot routines |
Plotting | Category index |
Handling of FITS files |  |
Conditional statements and loops |  |
Examples |  |

### Obtaining DPUSER

DPUSER has been ported to several platforms. For instructions how to get and install DPUSER, go to the installing page.

### Using DPUSER

DPUSER is a text-console program and therefore can be run on any terminal. On startup, you are greeted by a short message and the `DPUSER>` prompt appears. Now you are ready to type commands. As in a UNIX-shell, you can use the up- and down keys to browse previously typed commands. Filename expansion using the tab-key is also supported.

### The Author

DPUSER was written by Thomas Ott as a software package for reducing astronomical speckle data. If you have comments or suggestions regarding DPUSER, please feel free to contact me.

### Credits

The following packages and code snippets were used in developing DPUSER - The Next Generation:

- FFTW - The Fastest Fourier Transform in the West
- GSL - The GNU Scientific Library
- PGPLOT Graphics Subroutine Library
- The XPA Messaging System
- MPFIT
- Implementation of the Kabsch algorithm by Arno Formella
- GDL - GNU Data Language
- Python
- The Julian Date code was written by Christian Straubmeier
- ...and various other GNU tools: gcc, yacc, bison, readline...

### Warranty

Provided as is...