Hi Jan,
The issue you're encountering with parfeval is due to the fact that when you pass complex objects like iddata to parallel workers, MATLAB serializes these objects into a struct representation for transmission to the workers. When the workers receive the data, they do not automatically deserialize it back into the original object type. This is why class(data) returns 'struct' instead of 'iddata' within the parallel workers.
To work around this issue, you can modify your testFun function to check if the input data is a struct and, if so, convert it back into an iddata object. Here's how you can modify your testFun function:
function str = testFun(data, from)
str = sprintf("Hello from '%s'\n'data' is class '%s'\n", from, class(data));
try
% Check if 'data' is a struct and convert it to 'iddata' if necessary
if isa(data, 'struct')
data = iddata(data.OutputData, data.InputData, data.Ts, 'Name', data.Name);
end
nlarx(data, [1 1 1], idLinear);
str = sprintf("%sNo error in testFun.\n", str);
catch E
str = sprintf("%sError in testFun: %s\n", str, E.message);
end
end
Since you don't have the Parallel Computing Toolbox, you won't be able to use parfeval or backgroundPool. However, you mentioned using parfeval in your example, so I assume you have access to some parallel functionality.
To print or display text from a worker, you can use disp or other printing functions. However, the output will not be displayed in the MATLAB Command Window but in the log files associated with the parallel workers. You can also use diary to capture the output to a file.
Hope this helps!
