Add and Populate a MATLAB Function Block Programmatically
This example shows how to programmatically add a MATLAB Function block to a model and populate the block with MATLAB® code. If you already have MATLAB code and do not want to add it to a MATLAB Function block manually, this workflow can be convenient.
Create the files for the example.
Create and save a model
myModel.Create this MATLAB function and save it in
myAdd.m.function c = myAdd(a, b) c = a + b;
Write a MATLAB script that adds a MATLAB Function block to
myModeland populates it with the contents ofmyAdd.m.% Add a MATLAB Function block to a model and populate % the block with MATLAB code. % % Copyright 2017 The Mathworks, Inc. open_system('myModel.slx'); libraryBlockPath = 'simulink/User-Defined Functions/MATLAB Function'; newBlockPath = 'myModel/myBlockName'; add_block(libraryBlockPath, newBlockPath); blockHandle = find(slroot, '-isa', 'Stateflow.EMChart', 'Path', newBlockPath); blockHandle.Script = fileread('myAdd.m');
This line of the script adds a MATLAB Function block to the model:
add_block(libraryBlockPath, newBlockPath);
In memory, open models and their parts are represented by a hierarchy of objects. The root object is
slroot. This line of the script returns the object that represents the new MATLAB Function block:blockHandle = find(slroot, '-isa', 'Stateflow.EMChart', 'Path', newBlockPath);The
Scriptproperty of the object contains the contents of the block, represented as a character vector. This line of the script loads the contents of the filemyAdd.minto theScriptproperty:blockHandle.Script = fileread('myAdd.m');
Run the script.
You see the new MATLAB Function block in
myModel.
To see the code that you added to the block, double-click the block
myBlockName.
Save and close the model.
Modify the script for your model.
Replace
myModelwith the name of your model.Set
newBlockPathto the path for the new block for your model.Replace
myAdd.mwith the name of the file that contains the MATLAB function that you want in the MATLAB Function block. Alternatively, you can specify the code directly in a character vector. For example:blockHandle.Script = 'function c = fcn(a, b)';