GNU Octave - Bugs: bug #52604, [octave forge] (signal) invfreqs,...

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bug #52604: [octave forge] (signal) invfreqs, invfreqz iterative algorithm is not implemented

Submitter:	Stephen <sh986>
Submitted:	Wed 06 Dec 2017 05:14:23 PM UTC


Category:	Octave Package	Severity:	1 - Wish
Priority:	1 - Later	Item Group:	Matlab Compatibility
Status:	Postponed	Assigned to:	None
Originator Name:	Stephen	Open/Closed: *	Open
Release: *	dev	Operating System: *	Any
Fixed Release:	None	Planned Release:	None

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Sat 31 Aug 2024 09:20:58 PM UTC, comment #4: Unable to reproduce matlab results for invfreqz: pkg load signal a = [1 2 3 2 1 4]; b = [1 2 3 2 3]; [h,w] = freqz(b,a,64); [bb,aa] = invfreqz(h,w,4,5) [hh,ww] = freqz(bb,aa,64) # reproduce frequency response	Anonymous
Wed 21 Mar 2018 08:40:06 AM UTC, comment #3: I have added a warning message to the invfreqs and invfreqz functions when the iter or tol arguments are given. It should now be clear that the iterative algorithm is not yet implemented in these functions. http://hg.code.sf.net/p/octave/signal/rev/20e85c76d212	Mike Miller <mtmiller>
Thu 15 Feb 2018 09:28:48 PM UTC, comment #2: There is supposed to be a warning message printed in this function when the iteration parameter is given. The function should print "no implementation for iter yet" So this is a known missing feature of this function. Printing the warning again is easy, implementing the missing feature is a larger project.	Mike Miller <mtmiller>
Wed 06 Dec 2017 05:41:43 PM UTC, comment #1: Also, invfreqz(h,w,3,3,wt,30) shown below doesn't return the same result as matlab (see https://edoras.sdsu.edu/doc/matlab/toolbox/signal/spectop9.html) >> [b,a] = butter(4,0.4) b = 0.046583 0.186332 0.279497 0.186332 0.046583 a = 1.000000 -0.782095 0.679979 -0.182676 0.030119 >> [h,w] = freqz(b,a,64); >> [b4,a4] = invfreqz(h,w,4,4) b4 = 0.046583 0.186332 0.279497 0.186332 0.046583 a4 = 1.000000 -0.782095 0.679979 -0.182676 0.030119 >> wt = ones(size(w)); >> [b30,a30] = invfreqz(h,w,3,3,wt,30) b30 = 0.046389 0.178546 0.244578 0.127586 a30 = 1.00000 -0.95016 0.73823 -0.20056	Stephen <sh986>
Wed 06 Dec 2017 05:14:23 PM UTC, original submission: Matlab invfreqz(h,w,4,5,[],30) example doesn't give sample output as octave. See https://www.mathworks.com/help/signal/ref/invfreqz.html	Stephen <sh986>

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Follow 9 latest changes.

Date	Changed by	Updated Field	Previous Value	Replaced by
2019-02-26	mtmiller	Release	other	dev
2019-02-26	mtmiller	Carbon-Copy	Removed 80942	-
2018-03-21	mtmiller	Severity	3 - Normal	1 - Wish
		Release	4.2.1	other
		Summary	[octave forge] (signal) invfreqz(..., iterations) is not implemented	[octave forge] (signal) invfreqs, invfreqz iterative algorithm is not implemented
2018-02-15	mtmiller	Priority	5 - Normal	1 - Later
		Status	None	Postponed
		Operating System	Microsoft Windows	Any
		Summary	Matlab invfreqz(h,w,4,5,[],30) example doesn't give sample output as octave	[octave forge] (signal) invfreqz(..., iterations) is not implemented

GNU Octave - Bugs: bug #52604, [octave forge] (signal) invfreqs,...

bug #52604: [octave forge] (signal) invfreqs, invfreqz iterative algorithm is not implemented

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