Instructions: The current version of Lagrange requires that Python is already installed on your computer. It also requires two Python libraries: scipy and numpy. On Windows, install packages that match your version of Python (recommended: Python 2.5).
Note: you can check whether scipy is installed correctly by opening a Python shell (on Windows, try launching IDLE from the Programs menu). You will see a >>> prompt. Type:

>>> import scipy

and hit return. If no error messages appear, scipy is installed correctly.
Once you have installed Python, scipy, and numpy:

1. Download latest snapshot archive of Lagrange:
   • Lagrange-20100721.tar.gz (for Linux/Mac) or
   • Lagrange-20100721.zip (for Windows).
   Please check that you are using the latest snapshot version, released on 21 July 2010. The script will not work with earlier versions of Lagrange (e.g. 2.0.1).
2. Unpack the Lagrange archive. This will create a folder, Lagrange-20100721.
3. Place your script in this folder (not in the lagrange subfolder).
4. Run the script.
   • At a command prompt, type: python name.lagrange.py, or
   • on Windows, launch IDLE from the Programs menu, open the script, and choose Run:Run Module (shortcut key F5).
5. Results of the analysis are logged to a text file, name.results.txt.