I am facing a problem in Simulink.
When I want to write a bus signal to workspace in Simulink, I fail.
The next time I use a bus selector to select some signals in the bus and then write into the workspace. But I also fail this time with the error: 'The selected signal is invalid since it refers to a bus element within an array of subbuses'.
When I want to use the busselector to select the subbuses from the former busselector, I cannot find other signals.
So how to write a bus signal to a workspace?
Hello, dear Ji Song.
Since this a question more technical, I think the most appropriate place to ask is in the Stack Overflow: https://stackoverflow.com/
In the following link you will find questions regarding Simulink: https://stackoverflow.com/questions/tagged/simulink
Best regards.
Hello
I found this answer in mathwork website, I hope it is useful for you:
There are several ways to store bus signals in the MATLAB workspace. Please choose one of the following three approaches:
1. Starting with Simulink 7.9 (R2012a), the 'To Workspace' block can be used to store bus signals of any mixed data when using the MATLAB 'Timeseries' format. For more information on this, please refer to the following link:
http://blogs.mathworks.com/seth/2012/05/14/how-to-load-and-save-bus-signal-data/
2. To store bus signals in Simulink 7.6 (R2010b) in the MATLAB workspace as a structure with the same hierarchy and signal names, data logging can be used as follows:
1) Right click on the desired bus signal and select Signal Properties.
2) In the Signal Properties window, check the box for 'Log signal data'.
3) In the model's Configuration Parameters dialog box, select Data Import/Export in the left pane.
4) Select the Signal logging checkbox and specify the variable name where the bus signal will be stored.
The logged signal variable will be of the form:
variablename.busname.signalname
3. Unfortunately, the above methods do not work for models compiled with Real-Time Workshop. This is because Real-Time Workshop does not support signal logging. An alternative method can be used as a workaround, however it is less direct. The following steps demonstrate how to create a MATLAB structure from a bus signal's flattened array and the accompanying model.
1) Save the bus signal to a MAT-file using the To File block and select 'MAT-file logging' under Configuration Parameters>Real-Time Workshop>Interface>Data exchange
2) Compile and run the model and executable, respectively, to generate the MAT-file with the bus signal stored as an array.
3) From the Simulink model, use the following code to create a Simulink bus object:
busInfo = Simulink.Bus.createObject(mdlName, blkName); num_el = eval([busInfo.busName '.getNumLeafBusElements']); elemList = eval([busInfo.busName '.getLeafBusElements']);
4) Create an array of Timeseries objects that capture the signal data from your MAT-file:
load MyFile % generated in the second step for i = 1:num_el size = elemList(i).Dimensions; ts{i} = timeseries(data(i+1:i+size,:)',data(1,:)'); end
5) Finally, propagate the Simulink bus object with the above timeseries using the CREATESTRUCTOFTIMESERIES method:
MYBUS = Simulink.SimulationData.createStructOfTimeseries(busInfo.busName,ts);
End of answer
Bast Regards
Mohammed Moanes Ezzaldean Ali
Thanks, As for your first two suggestions. Because my version of Simulink is R2019B, I cannot directly use 'To workspace' with the error I said before.
And I try to use 'To file' to collect bus signal with the error ' is unable to log an array of non-virtual buses or a non-virtual bus containing an array of sub-buses '
When I try to use the bus selector to get the signal, the error ' Error in port widths or dimensions ' comes out.
Now I get the answer to write the bus signal (with subbus signals ) to workspace.
First use the bus selector to get the signal and the subbus signal.
Then use selector for the subbus signal with certain input port size and choose the index of index vector to [1].
Finally use the bus selector connected with selector to get the signal you want, and then use 'to workspace' to get the data you want.
Thanks all for your answer.
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