I appreciate your help; however, neither suggestion works: I still get
the same error message.
The similar line
[frq,repf]=repfreq(hz,0.01,0.49);
has no problem
Your problem arises because one frequency value you ask for
corresponds exactly to a zero of hz.num
log(roots(hz.num))/(2*%pi)
so you want to compute the gain in dB of a zero value which is -inf
To avoid such problem you can let repfreq to do the frequency
discretization.
[frq,repf]=repfreq <repfreq.html>(hz) or equivalently
[frq,repf]=repfreq <repfreq.html>(hz,0,0.5)
in this case the discretization uses varying frequency step
Serge
Le 23/02/2016 14:41, grivet a écrit :
Le 23/02/2016 14:21, Serge Steer a écrit :
Please can you give more details :
value of Order and Fcutoff/Fs/2
and what you are doing with hz (because iir does not call dbphi)
Serge
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