I'll try to simplify my questionMy guess isfrequency= +-angle/(2pi) 0<= angle<=pifrequency = +-(2pi-angle)/(2pi) pi<angle<2pi1) am I right?2) If so, is it correct: why frequencies are alwaysbetween -1/2 and 1/2 ?Oleh8 листопада 2018, 13:22:40, від "Sven Schreiber" <svetosch@gmx.net>:Am 08.11.2018 um 10:46 schrieb oleg_komashko@ukr.net:I'm not sure I understand the question. If the root is 0.5 + i*0.1, then the angle should be atan(0.1 / 0.5) = 0.19739556 (in radians).> it is the angle of the rootThe matter is in that it is afunction of the angleI have failed to guess whatthe function it is. That's whyI have asked.
Then you still have to factor in that the ARMA "roots" that are given are probably not the ones inside the unit circle (for stability), but in fact the inverse roots outside the circle. So before taking the atan you'd have to invert the root.
Is that what you mean?
thanks,
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