# Python-control/Download

This page contains information for downloading and installing python-control. This package is designed for use in the IPython environment, with SciPy extensions for scientific computing plus the matplotlib extensions (which enables MATLAB-like plotting).

- Source code - download the latest version of the python control library here

## Prerequisites

### Standard python libraries

In order to run control-python, you must first install some standard python packages:

- SciPy - Open source library of scientific tools: http://www.scipy.org
- Matplotlib - Plotting library for python: matplotlib.sourceforge.net
- ipython (optional) - interactive python shell: http://ipython.scipy.org

If you have everything installed correctly, you should be able to run the following code

from scipy import * from pylab import * # Not needed if you use ipython -pylab a = zeros(1000) a[:100]=1 b = fft(a) plot(abs(b)) show() # Not needed if you use ipython -pylab

### SLICOT

Some of the underlying functions in python-control are carried out using the SLICOT software library. The python-control library uses the slycot python wrapper developed by Enrico Avventi at KTH.

- Slycot is only required for functions that make use of SLICOT routines (eg, linear quadratic regulators, Kalman filtering, \(H_\infty\) control)
- The slycot library is currently under development and the API is not yet fixed. Some errors may occur if the version of slycot and python-control are incompatible

## Download

The python-control package can be downloaded from SourceForge:

The files are distributed as compressed tar files. To unpack and installed, run the following from the command line

tar xzf control-N.mx.tar.gz cd control-N.mx python setup.py install

where N-mx is the latest release (eg, 0.3c).

To see if things are working, you can run the script secord-matlab.py (using either python or ipython -pylab). It should generate a step response, Bode plot and Nyquist plot for a simple second order linear system.

## Installation notes

### slycot

- To compile for 64 bit architecture on OS X, edit setup.py to include the lines

extra_link_args=['-arch x86_64']

- and then run setup.py as

python setup.py config_fc --arch="-arch x86_64" build