[Octave-bug-tracker] [bug #56560] Error by addition of two frd objects (control package)

[Jonas Frischknecht]

URL:
  <https://savannah.gnu.org/bugs/?56560>

                 Summary: Error by addition of two frd objects (control
package)
                 Project: GNU Octave
            Submitted by: jonas24
            Submitted on: Thu 27 Jun 2019 09:08:52 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Microsoft Windows

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Details:

The following code

% generate a frequency vector and response data 
freq = logspace(1,4);
resp = 1.23*(freq).*exp(i*2*freq);
% Create a FRD model
sysTEST = frd(resp,freq,1e-3);
NewSys = sysTEST + sysTEST;

gives the error, that the systems must have identical sampling times (works
with Matlab).

By calling the frd function without the sampling time it works also in ovtave.
But in that case it isn't possible to set the sampling time like this:

NewSys.Ts = 1e-3;

The error "invalid sampling time" appears.




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