[Octave-bug-tracker] [bug #60475] [ocatave forge] (signal) buttap poles have a different order

[Charles Praplan]

Follow-up Comment #3, bug #60475 (project octave):

Different zero and poles ordering is not an error.
Even Matlab does not sort poles and zeros in complex conjugate pairs.
In the page following the one you cite, you have an example:

Matlab:
>> [z,p,k]=cheb1ap(4,2) 
z =
     []
p =
  -0.1049 + 0.9580i
  -0.2532 + 0.3968i
  -0.2532 - 0.3968i
  -0.1049 - 0.9580i
k =
    0.1634

Note that for the same example Octave returns a complex gain, what is not very
good:

>> [z,p,k]=cheb1ap(4,2)
z = [](0x1)
p =

  -0.1049 - 0.9580i
  -0.2532 - 0.3968i
  -0.2532 + 0.3968i
  -0.1049 + 0.9580i

k =  1.6345e-01 + 2.7559e-18i


    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?60475>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/