MATLAB: How to modify GET_PARAM to return ‘OutputSignals’ property of ‘Bus Selector’ as a cell array

simulink

If you open the model 'busdemo' and run the following command,

get_param('busdemo/Bus Selector', 'OutputSignals')

the output is comma-seperated set of strings as follows:

 bus2.Pulse,bus1.Chirp

I would like this output to be a cell array.

Best Answer

The functionality to obtain the 'Output Signals' property of 'Bus Selector' block as a cell array is not available in Simulink 6.6 (R2007a).

As a workaround, you can use 'porthandles' property of the block and then use 'Name' property of output ports as in the following example:

ph = get_param('busdemo/Bus Selector', 'porthandles');
a = get_param(ph.Outport,'Name');

Related Solutions

MATLAB: How to retrieve names of signals in a bus when the signal names have been propagated by Simulink

This enhancement has been incorporated in Release 2010a (R2010a). For previous product releases, read below for any possible workarounds:

The ability to use a command-line command to retrieve the names of propagated signals in a bus signal is not available in Simulink.

To work around this issue, use the following code:

busdemo
ph = get_param('busdemo/Bus Creator', 'porthandles')
set_param(ph.Outport, 'CacheCompiledBusStruct', 'on')
busdemo([],[],[],'compile')
bs = get_param(ph.Outport, 'CompiledBusStruct')
busdemo([],[],[],'term')

The variable 'bs' will contain information on the bus signal coming out of the Bus Creator. You can recursively walk through this structure to determine all actual sources of the bus and hence all source data types, dimensions, signal names, etc.

Note that the following code makes use of the internal compiled property 'CacheCompiledBusStruct' and hence is subject to change in future releases.

Another workaround to retrieve the names of signals in a bus is to pass all the Bus Creator outputs to a Bus Selector block, which selects all of the signals from the Bus Creator block, then use the following code to extract the signal names, where the Bus Selector block is the currently selected block:

get_param(gcb, 'OutputSignals')

MATLAB: Is the output of the Bus Selector block with the ‘Muxed Output’ option checked a bus or a mux signal (R14SP2)

The intended use of the 'Muxed Output' option is to create buses. This option is mislabeled. With that in mind, signals leaving this block should only feed bus capable blocks.

This option can cause difficulty due to the fact that when an outgoing signal is the same datatype it can be treated as a mux signal. For instance, as an input to a Gain block.

You should treat the output of a Bus Selector block with the mislabeled 'muxed output' option checked as a bus.

If you want a muxed signal, use a Bus Selector block to select the desired signals, which must have the same datatype and be scalars or vectors and connect those signals to a Mux block.

Please refer to the Related Solution for more information.

The option lets you prune one bus to produce another smaller bus.

Best Answer

Related Solutions

MATLAB: How to retrieve names of signals in a bus when the signal names have been propagated by Simulink

MATLAB: Is the output of the Bus Selector block with the ‘Muxed Output’ option checked a bus or a mux signal (R14SP2)

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