[python-control-discuss] some problems with control-0.6c

[Roberto B. <rob...@su...>]

Hi all

I'm testing the last control-0.6c toolbox in order to actualize my
yottalab package and I found some differences between the results of a
couple of functions:

1) the c2d function should maintain the form of the state-space
function. It seems that the system is first transformed into a transfer
function and then discretized. In my opinion it is important that the
state-space form of the discrete system is exactly the same (same
states) that I have in the continuous representation.

2) The dare functions gives some wrong results, and I'll check the lqr
function asap. Using the delivered "dare" function (mateqn.py) I have
wrong values of the feedback gains (compared with the values given by
matlab dlqr and scilab)

3) the lqr function doesn't accept a call like 

lqr(sys,Q,R) -> only 3 parameters!


In the next time I'll check the gains returned by the lqr function,
compared with matlab and scilab.

Best regards

Roberto