MATLAB: Does the input bus in a masked reference model seems to be empty

busmodel maskreference model

In the bus editor I defined a couple of busses.

case 1: In my parent model I refer to another model. The interface is defined by one of the above mentioned already defined busses. Using a bus selector I am able to use signals originating from the parent model in the referenced model. This works great!

case 2: In my parent model I refer two times to a single model. To be able to parameterize these referenced models I applied a mask to model. This works great! Now I am able to create two instances of the same model. However, the input bus which worked fine in case 1 now seems to be empty, even though this is not the case.

When I open the reference model (not an instance, but the source .slx file), the input bus indeed seems to be empty. Copying this reference model and removing the mask solves this problem. However, I need the mask to parameterize multiple instances.

What is going on? Why aren't busses recognized in masked models?

Best Answer

The solution was actually quite simple. For some reason Simulink does not recognize the bus until you build the model. Building the model solved my problem.

Why the model only needs to be build when it is masked and not when it is not masked is still not clear to me, but at least it works now.

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MATLAB: Masked image displaying wrong intensity

Try this instead, which will select only the pixels in image dictated by the mask:

%to get the masked image without changing the dimension of the image
masked_image = image.*(mask > 0);
%or if you want just the pixels
masked_image_pixels = image(mask > 0);

Note that mask should really be a logical array, not a uint8 array, which is what (mask > 0) is taking care of for you.

In your original code, the issue is that you are using a uint8 mask matrix to multiply element-by-element with the image matrix. This means doing the following:

image .* mask
(value from the image matrix) x (255 or 0 from the "binary" uint8 mask matrix)

which would explain the large numbers.

MATLAB: Am I receiving an error related to “OutputPortOutputBusAsStructs” when using model reference and virtual buses

Root-cause of the error:

This error is thrown due to a combination of the following two factors:

1. There is a mismatch between the reference model outport and the reference block in the top model:

The top model is expecting a nonvirtual bus.
But the reference model checkbox is not selected to" output as nonvirtual bus in parent model":

2. Plus, "Ports and parameters mismatch" is set to "error" in Diagnostics > Model referencing in the configuration parameters.

How to fix this error:

If you want to output a nonvirtual bus from the reference model, you can check the option "output a nonvirtual bus in parent model" in the outport inside the reference model (see image above), and the error will be fixed.
If you want a virtual bus, you will need to update the reference model block from the top model, so that the configuration is updated based on the referenced model:

If the "Ports and parameters mismatch" diagnostic were set to "none", the model reference block is automatically updated. Because it is set to "error" here, you will need to update it manually.

Best Answer

Related Solutions

MATLAB: Masked image displaying wrong intensity

MATLAB: Am I receiving an error related to “OutputPor​tOutputBus​AsStructs” when using model reference and virtual buses

Related Question

MATLAB: Am I receiving an error related to “OutputPortOutputBusAsStructs” when using model reference and virtual buses