bugGNU Octave - Bugs: bug #60075, [octave forge] (control) Incorrect...

 
 

bug #60075: [octave forge] (control) Incorrect behavior with octave bode with complex state space model

Submitted by:  Nidish Narayanaa Balaji <nidish>
Submitted on:  Thu 18 Feb 2021 01:07:02 PM UTC  
 
Category:  Octave Forge Package Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  None Assigned to:  None
Originator Name:  Nidish Narayanaa Balaji Open/Closed:  Open
Release:  5.2.0 Operating System:  GNU/Linux

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Thu 18 Feb 2021 01:07:02 PM UTC, original submission:  

I have attached a code wherein I'm generating an interpolatory model of a simple SDOF oscillator with the Loewner framework.

I introduce a similarity transformation to convert the matrices to real projection and then create two state space systems - one is complex and another is real.

When I use "bode" to compute the frequency responses, only the real system gives me the correct result - the complex system is incorrect. The same code works perfectly on MATLAB, though.

Nidish Narayanaa Balaji <nidish>

 

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Attached Files
file #50877:  sdof.m added by nidish (900B - text/x-objcsrc)
file #50878:  sdof.m added by nidish (900B - text/x-objcsrc)

 

Depends on the following items: None found

Items that depend on this one: None found

 

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2021-02-18 mmuetzel Carbon-CopyRemoved 102357 => -
    2021-02-18 mmuetzel SummaryIncorrect behavior with octave bode with complex state space model => [octave forge] (control) Incorrect behavior with octave bode with complex state space model
    2021-02-18 nidish Attached File- => Added sdof.m, #50877
        Attached File- => Added sdof.m, #50878

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