Use struct to set symbolic dimension of Simulink bus element

Hello,

I am trying to use a struct available in my model's data dictionary to symbolically set the dimension of a bus element. Below are the lines of code I am using

myBusElements(1)            = Simulink.BusElement;
myBusElements(1).Name       = 'myElement';
myBusElements(1).Dimensions = 'myDataDictionaryObject.myBusElementSize';
myBus                       = Simulink.Bus;
myBus.Elements              = myBusElements;

Here is the error message I get

The 'Dot' operation is not supported as part of a symbolic dimension.

'myDataDictionaryObject.myBusElementSize'

^ To disable symbolic dimension propagation, clear 'Allow symbolic dimension specification' parameter in

the Configuration Parameters dialog box.

Any way to work around this? using a struct is a rigid requirement that I cannot ignore unfortunately as the struct in the data dictionary can change between model build and model run

Thanks!

Answer 1

[Ishu]

Hi Khushal,

I understand that you are trying to set the "Dimensions" property of "Simulink.BusElement" as a variable. You can use this method to set the parameters of other blocks like "Constant", "Gain" but this method is not supported for "Simulink.BusElement" that's why you are getting error.

To set "Dimesnions" you can follow below approach:

% ddPath - Path to your dictionary
dd = Simulink.data.dictionary.open(ddPath); %Open your dictionary
ddSection = getSection(dd, 'Design Data'); 
ddEntry = getEntry(ddSection, 'myDataDictionaryObject'); 
myStruct = getValue(ddEntry) % get the struct 
myBusElementSize = myStruct.myBusElementSize; % get the dimension for bus element

myBusElements(1).Dimensions = myBusElementsize; %set the dimension

For more information on "Simulink.BusElement" you can refer below documentation:

https://www.mathworks.com/help/simulink/slref/simulink.buselement.html

Hope it helps!