Re: control - isminimumphase()

[Lukas Reichlin]

On 11.07.2014, at 23:12, "Kozma, Endre" <address@hidden> wrote:

> Hello,
> 
> the isminimumphase() function tests only the zeros of the specified system 
> whether they all are in the LHP or inside the unit circle. Based on the 
> definition of the minimum-phase system the function should test also the 
> poles. Or is it expected that the specified system is casual and stable?
> 
> Theorizer

Hi Endre,

Thanks for your feedback. You are right, according to [1], both the zeros and 
the poles of a minimum-phase system must be strictly inside the left complex 
half-plane (continuous-time case) or inside the unit circle (discrete-time 
case). I pushed the following changesets:

https://bitbucket.org/paramaniac/control/commits/fc22508400fbbe3f0513288a7bb5fb2429af9ab4
https://bitbucket.org/paramaniac/control/commits/2c580104f15f191d52b0165832e1e3c63dcc5c9b

Best regards,
Lukas

[1]
http://en.wikipedia.org/wiki/Minimum_phase