Re: A question regarding unwrap

[Paul Kienzle]

On Sep 24, 2005, at 9:30 PM, Ron Crummett wrote:

> Hi -
>
> I have a recent problem with unwrap; I tried plotting the phase of a 
> transfer function and it jumped halfway through the plot, from -180 to 
> 180.  I tried to unwrap the phase using unwrap and plotted the phase 
> again, but still had the same jump.  Reading the help on unwrap, it 
> sounds like it will only really work if the phase is positive (it adds 
> 2*pi).  For me, I have a negative phase, so I need to subtract 2*pi.  
> Any idea of what the solution could be?  I tried looking at the code 
> but couldn't make too much sense out of it from my few glances.

Please post a short example that breaks to address@hidden

The shortest one I can come up with works fine:

octave> unwrap([-pi,pi])
ans =

  -3.1416  -3.1416

Thanks,

- Paul



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