GNU Octave - Bugs: bug #53649, [octave forge] (control) tf could...

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bug #53649: [octave forge] (control) tf could be more tolerant to complex coefficient

Submitter:	Charles Praplan <charprap>
Submitted:	Sat 14 Apr 2018 07:35:22 AM UTC


Category:	Octave Package	Severity:	3 - Normal
Priority:	5 - Normal	Item Group:	Missed Error or Warning
Status:	Need Info	Assigned to:	None
Originator Name:	Charles Praplan	Open/Closed: *	Open
Release: *	4.2.2	Operating System: *	Microsoft Windows
Fixed Release:	None	Planned Release:	None

* Mandatory Fields

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Sun 15 Apr 2018 10:24:13 AM UTC, comment #4: Yes, same behavior as Matlab will be fine.	Charles Praplan <charprap>
Sat 14 Apr 2018 08:25:21 PM UTC, comment #3: This is the complete output: Warning: The numerator or denominator of this transfer function has complex-valued coefficients. > In tf (line 360) SYS = (0.253+1e-18i) --------------------- z^2 - 1.158 z + 0.411 Sample time: 0.0001 seconds Discrete-time transfer function.	Alexander Wilms <alexanderw>
Sat 14 Apr 2018 08:19:57 PM UTC, comment #2: Output of Matlab R2018a: Warning: The numerator or denominator of this transfer function has complex-valued coefficients.	Alexander Wilms <alexanderw>
Sat 14 Apr 2018 08:55:31 AM UTC, comment #1: How tolerant do you want it? What does matlab do?	Doug Stewart <dastew>
Sat 14 Apr 2018 07:35:22 AM UTC, original submission: Function tf could be more tolerant to complex coefficients in case of residual imaginary part due to arithmetic rounding. See example below. A warning would be better. SYS=tf([0 0 0.253+j*1e-18] , [1, -1.158, 0.411], 1e-4)	Charles Praplan <charprap>

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Date	Changed by	Updated Field	Previous Value	Replaced by
2018-04-14	mtmiller	Category	Libraries	Octave Package
		Status	None	Need Info
		Summary	tf could be more tolerant to complex coefficient	[octave forge] (control) tf could be more tolerant to complex coefficient

GNU Octave - Bugs: bug #53649, [octave forge] (control) tf could...

bug #53649: [octave forge] (control) tf could be more tolerant to complex coefficient

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