Load code for a MATLAB function block at Simulink runtime

Question

I would like to have some file, myfunc.m, in my MATLAB path and somehow load its contents into a MATLAB function block automatically just before the simulation

Answer 1

If the target MATLAB Function block doesn't already exist then you can add it as follows (see this SO post):

load_system('eml_lib');
libname = sprintf('eml_lib/MATLAB Function');
add_block(libname,'myModel/myBlockName');

You can then modify the block's code using the Stateflow API:

sf = sfroot();
block = sf.find('Path','myModel/myBlockName','-isa','Stateflow.EMChart');
block.Script = 'Your code goes here';

See also this post on MATLAB Answers.