[python-control-announce] Version 0.3d of python-control released

[Richard M. <mu...@cd...>]

Version 0.3d of the Python Control Systems Library (python-control) has just been posted to SourceForge.  The main changes for this version are:

* New function: rlocus(), courtesy Ryan Krauss <rk...@si...>
* New function: pade(), courtesy Sawyer Fuller <mi...@ca...>
* New functions: nichols(), ngrid(), courtesy Allan McInnes <All...@ca...>
* Added lsim() wrapper to allow systems with poles at origin.  Still need to fix this for step() and impulse()

A detailed list of changes is included below.

The next release of python-control will be a version 0.4a and will have some fairly significant changes in the underlying class structure, courtesy of Brandt Belson, Steve Brunton, Kevin Chen, and Lauren Padilla at Princeton.

-richard

2011-02-12  Richard Murray  <murray@sumatra.local>

	* setup.py: Updated version number to 0.3d, in preparation for release

	* src/statefbk.py (lqr): Updated sb02md calling signature to match
	latest slycot version (Lauren Padilla)

	* src/freqplot.py (nichols_grid): new function from Allan McInnes
	<all...@ca...> to generate a Nichols chart for a
	given plot (equivalent to ngrid in MATLAB).

	* src/matlab.py (ngrid): MATLAB compatible ngrid() command

2010-11-05  Richard Murray  <murray@sumatra.local>

	* external/yottalab.py: New file containing Roberto Bucher's control
	library functions.  OK to start pulling these into the main library,
	with attribution, but note that they use modifications of the
	default library => some rewrites will be needed.

2010-09-11  Richard Murray  <murray@sumatra.local>

	* src/matlab.py (step): Added local step response function that uses
	lsim2() instead of signal.step (which can't handle integrators).
	This function may not be needed when new scipy step2() function is
	available.
	(impulse): Added local impulse response function that sets the
	initial condition based on the input matrix and then uses the
	lsim2() function to compute the response.

	* examples/test-response.py: Added test script for making sure that
	time repsonse functions are working as desired

	* src/matlab.py (lsim): Added local version of lsim that calls
	signal.lsim2 (actual ODE integrator)

2010-09-06  Richard Murray  <murray@sumatra.local>

	* src/statefbk.py (ctrb): new function for testing controllability
	* src/statefbk.py (obsv): new function for testing observabiilty

2010-09-02  Richard Murray  <murray@sumatra.local>

	* src/statefbk.py (place): Use np.size() instead of len() for
	finding length of placed_eigs for better compatability with
	different python versions [courtesy of Roberto Bucher]

	* src/delay.py (pade): New file for delay-based computations +
	initial implementation of pade() [courtesy Sawyer Fuller]

2010-06-17  Richard Murray  <murray@sumatra.local>

	* src/rlocus.py: changed num, den to nump, denp for clarity
	* src/rlocus.py: new file with Ryan Krauss's root locus code