Default bode axis to Hz in R2024b

Since matlab R2024b the bode command creates my plots in rad/s instead of Hz. In the past I used to set the default axis to Hz by setting cstprefs. Now this doesn't work anymore and I have to manually change every bode plot to Hz. Any suggestions on how to set the default in this version?

This code in R2022b gives a plot in Hz, and in R2024b gives it in rad/s

set(cstprefs.tbxprefs,'FrequencyUnits','Hz','grid','on');
bode(ss(1))

Edit: The set command normally runs as part of the startup script, and hence sets a default option. Here I placed it like this to reproduce the issue.

Answer 1

[Star Strider]

I did not see any changes to that in the Release Notes, however that does not mean that they were not changed. The only relevant reference I can find is Specify Plotting Preferences for Linear Analysis and Specify Toolbox Preferences for Linear Analysis Plots and nothing that uses the syntax that you posted. They in turn refer to the ctrlpref function.

Another option is to put this in your startup file.

[Harm Weerts]

The option to get Hz as axis gets set in ctrlpref in my startup script. The problem is that the bode command does not use this setting anymore, it seems to be a bug in this Matlab version. My question is if there is a workaround for it.

[Star Strider]

I was not able to find more in the documentation than I posted. (I usually define 'Frequencyunits' when I use a specific plot, such as bodeplot or define them in the system itself when I create it.)

It may be necessary for you to Contact Support for this.

[Harm Weerts]

Thanks, I will submit a ticket for it

[Star Strider]

My pleasure!

EDIT — (24 Oct 2024 at 19:02)

Also see the Control System Toolbox Release Notes

[Harm Weerts]

According to support it is a known bug in R2024b. My guess is due to the change that is listed in the control systems release notes. The workaround is to specify the bode options explicitly with bode(ss(1),bodeoptions('cstprefs')).

[Star Strider]

That was my impression as well.