frestimate (data,w,units) not working

Hello,

I am trying to do a frequency response analysis of Boost converter output impedance in simulink.

I have previously used the frestimate function succesfully, and I am not sure what is now causing the problem.

Frequency response estimator is setup with sample time equal to switching period. Excitation Signal source is Block parameters.

Experiment mode is sinestream, and I am processing offline, in MATLAB using command below.

logdata=logsout{1}.Values;
sys_estim=frestimate(logdata,f_test,'Hz');

I get the following error:

Index exceeds the number of array elements (0).

Error in freblkData2Frd (line 35)
    IsSuperimposeMode = running(2)>(SI+SS)/2;

Error in frestimate (line 78)
        varargout{1} = freblkData2Frd(data,w,units);

What is causing this problem? Thanks alot!

Answer 1

[Harshendra Shah]

This error message can occur if your model is corrupted.

You can try to copy the contents of the model into a new Simulink model with the same configuration parameter settings and simulate it.

You can also check if the logdata and f_test parameters that you are passing are not empty.

Hope this helps.

[Ivan Petric]

In the end, I noticed that the error report keeps showing when I have scope attached to output data port.

When I disconnected it, the model started working properly.

It is probably some bug, that might be worth investigating from MATLAB side.

Thanks for the answer!

[Derry Lapin]

I'm receiving the exact same error. I will try removing my scopes to see if that fixes the problem.

Answer 2

[miguel rodriguez]

I'm experiencing the same thing, can someone from Matlab comment on this? Removing the scopes seems a bit arbitrary.