MATLAB: Simulink: Is there an easy way to replicate a sub-system in the same simulation

replicationsimulinksubsystem

I have a simulation composed of several interconnected subsystems, and I wish extend this to simultaneously, but independently, simulate the same process, but in the reverse direction.

I know that I can copy & paste my existing blocks, then manually rename the variables, gotos, etc.

Wondering if there is a simple and easy way to do this where these are renamed automatically (maybe adding pre-/suffix to the existing names)?

I've tried to keep this general, as I think any answer would apply whatever you might be doing with simulink, but am happy to provide any and all details, if it will help someone find an easier solution.

Best Answer

You can automate this using a script. Some relevant functions include:

add_block to add and copy blocks, as well as position them
add_line to connect blocks together
set_param to rename blocks or change block parameters e.g. Goto/From tag names

- Sebastian

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MATLAB: Find the name of last inport in sub-system

find_system(gcs, 'SearchDepth', 1, 'BlockType', 'Inport', 'Port', num2str(length(find_system(gcs, 'SearchDepth', 1, 'BlockType', 'Inport'))))

where gcs is the subsystem handle you want to search.

MATLAB: Change “current block”/gcb/gcbh programmatically

Is it not possible to change the code to use block path (string such as 'myModel/Gain') instead of gcb or gcbh? This would be the most straightforward thing to try. If you cannot do this for various reasons:

How do you get the value of hBlock? If you are hard coding it as a variable (by specifying a number) there could be two issues with this:

As this documentation says, You can use the block handle in subsequent calls to get_param or set_param. If you examine the handle, you can see that it contains a double. Do not try to use the number of a handle alone (e.g., 5.007) because you usually need to specify many more digits than MATLAB displays. Instead, assign the handle to a variable and use that variable name to specify a block. Use getSimulinkBlockHandle to get the handle to a block.
Using hard coded values might result in breaking of logic since Simulink can change the handle to the block every time the model is loaded/opened. For e.g it could be 16.0001 now. If I close and open the model again, it maybe different.
I am guessing the equality test might fail because you are trying to compare two floating point numbers.

For e.g. if I do this, it seems to work:

%Open demo model
vdp
%Set Mu block as selected
set_param('vdp/Mu','Selected','on')
%Get Handle to the block
hBlock = getSimulinkBlockHandle(gcb)
%Compare handle value to gcbh
isequal(hBlock,gcbh)

If you run this code mutliple times (each time clearing workspace and closing the open vdp model), you can see the value of hBlock keeps changing.

Best Answer

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MATLAB: Find the name of last inport in sub-system

MATLAB: Change “current block”/gcb/gcbh programmatically

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