For example in https://www.mathworks.com/help/simulink/gs/navigate-model.html it refers to a smart_braking model. This model does not exist in my install.
open_system(fullfile(matlabroot,'help', 'toolbox', 'simulink', 'examples', 'smart_braking')) 'C:\Program Files\MATLAB\R2018a\help\toolbox\simulink\examples\smart_braking' is not a valid Simulink object name and no matching file found.
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