MATLAB: Do I get individual Timeseries objects when I log a muxed signal in Simulink 6.5 (R2006b)

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I use a Mux block to create a vector signal. When I log this signal I do not get one Timeseries object containing all elements of my vector signal. Instead I get a TsArray containing a Timeseries for each scalar signal.

Best Answer

The ability to log a muxed signal as a single Timeseries object is not available in Simulink 6.5 (R2006b).

The reason why a TsArray is produced when logging a Mux signal is because the component signals of the Mux are not in contiguous memory. The Concatenate block outputs a contiguous array, which is why you see a TimeSeries. The Mux block does not make any guarantee about the contiguity of the output signal.

You can work around this by using the Concatenate Block from the Simulink Math Operations library instead. More information on this block can be found by executing the following command at the MATLAB prompt

docsearch concatenate

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MATLAB: How to query the signal dimensions of a virtual bus connected to a top-level Outport

The "CompiledPortDimensions" attribute is different because for a bus connected to a top-level Outport, there is no equivalent of a virtual bus in C/C++ when it comes to code generation. So the signal needs to be interpreted as a muxed signal (a vector), which would be an array for C/C++ code. Thus, "CompiledPortDimensions" gives you the correct information about how the signal is interpreted in the generated code.

To retain the long format used for virtual buses, you can try one of the following ways:

Option 1: Temporarily disconnect the virtual bus from the top-level Outport and then query "CompiledPortDimensions" for the block which outputs the bus signal. For an example, please open the subsystem in the attached model and then run the attached script.

Option 2: The recommended workflow is to assign a bus object to the top-level Outport to ensure that the output is indeed interpreted as a Bus. The bus would now be a struct in the generated code.

To programmatically get the dimensions of the signals contained in the bus object, select the Outport in Simulink and execute the commands below in MATLAB. This will create a cell array 'Dimension', with each cell containing the dimensions of the corresponding bus element.

>> temp = get_param(gcb, 'CompiledPortDataTypes');
>> name_cell = temp.Inport;
>> name = name_cell{1};
>> BusElementArray = eval([name '.Elements']);
>> for i=1:numel(BusElementArray)
>>     temp = BusElementArray(i);
>>     Dimension{i} = temp.Dimensions;
>> end

MATLAB: Is there a way to create Simulink.TsArray objects in the MATLAB workspace to be read in by an Inport in Simulink 6.4 (R2006a)

In MATLAB 7.12 (R2011a), it is recommended to use a structure of MATLAB timeseries objects to import bus signals into a simulation. This is explained here:

http://www.mathworks.com/help/releases/R2011a/toolbox/simulink/ug/bsuwngp.html

See attached files createdata_R2011a.m and testMDL_R2011a.mdl for an example

For versions prior to MATLAB 7.12 (R2011a), it is possible to create a Simulink.TsArray object in the MATLAB workspace. The attached files simple_script.m and simple.mdl reads the data in from the workspace into a bus. Note that the schema.prop method needed for versions prior to R2011a is subject to change in future releases.

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MATLAB: How to query the signal dimensions of a virtual bus connected to a top-level Outport

MATLAB: Is there a way to create Simulink.TsArray objects in the MATLAB workspace to be read in by an Inport in Simulink 6.4 (R2006a)

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