Re: PROBLEMS IN EVALUATING A TRANSFER FUNCTION THROUGH THE arx and bode algorithms

[Doug Stewart]

On Thu, Apr 18, 2019 at 9:18 PM Zeev Sherf <address@hidden> wrote:

Hi

 

When the following sequence of commands is applied to calculate a transfer function

 

DAT = iddata (xrun',xrun',dt);

[SYS, X0] = arx (DAT, 'NA', NA, 'NB', NB);

  W=2*pi*frv;

[MAG, PHA, W] = bode (SYS, W);

 

MAG should be 1 for all the frequencies and PHA shall be zero for all frequencies

 

It doesn't happen

Can some one help?

 

Thanks in advance

 

Zeev

 

What xrun

dt

NA

NB

frv

Please give us a working example. 

I made my own dataset and got 0db and 0phase.

--

DAS