Problems passing external input data into root-level Inport

I have a matlab function that takes a single vector as input.

In my function which I deploy for testing I create this input vector using

u = 0.1:0.1:(stopTime/0.01);
uStruct.time = [];
uStruct.signals.dimensions = 1;
uStruct.signals.values = reshape(args.InputData,numel(args.InputData),1);

where stopTime is the value used in the later called simulink model as the sample time parameter of the Input port u.

However after compiling and deploying as a microservice I get the following error:

{"error":{"id":"Simulink:SimInput:NonDatasetRootInportError","message":"Error loading external input data into root-level Inport microserviceDemo\/u in model 'microserviceDemo'.","stack":[],"type":"matlaberror"}}* Connection #0 to host localhost left intact

That error doesn't really give me much details on what is actually going wrong, or am I missing something here? Any hints?

Thanks fo your support.

Answer 1

[Jack]

The error is due to the external input structure not being set up correctly. In your code, uStruct.time is left empty, which causes MATLAB to throw an error when loading data into the root-level Inport. The external input must be provided as a valid dataset that includes a proper time vector. For example, if your sample time is 0.01 and stopTime is the end of your simulation, you could do:

t = 0:0.01:stopTime; uStruct.time = t; uStruct.signals.dimensions = 1; uStruct.signals.values = reshape(args.InputData, numel(args.InputData), 1);

This ensures that the external input data has the required time field along with the corresponding signal values.

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[Marcus]

Yes, empty vector, must have been too late, thanks :)