outstanding changesets

[Daniel J Sebald]

Ben Abbott wrote:
> 
> On Jan 29, 2009, at 1:50 AM, Søren Hauberg wrote:
> 
>> ons, 28 01 2009 kl. 22:13 -0500, skrev John W. Eaton:
>>
>>> Does Matlab produce the same result?
>>
>>
>> Matlab produces the attached pdf
>>
>> Søren
>> <matlab_freqz.pdf>
> 
> 
> ? ... that is not what I expected. My impression was the Matlab  
> unwrapped the phase in such a way that only positive delays would  
> result. However, in this example, it appears to be opposite.
> 
> Any idea what they are doing?

To "unwrap the phase" does not mean disallowing negative, it means to remove any 360 degree jumps from the phase which were created as a consequence of the modular arithmetic of phase angles.  Note that if there are 180 degree phase shifts, those stay because they are actual phase jumps.

Dan