A MEX file is a function, created in MATLAB, that calls a C/C++ program or a Fortran subroutine. A MEX function behaves just like a MATLAB script or function. To call a MEX function, use the name of the MEX file, without the file extension. The MEX file contains only one function or subroutine.

1. Create the Entry-Point Function.
2. Create the Test File.
3. Open the MATLAB Coder App.
4. Specify Source Files.
5. Define Input Types.
6. Check for Run-Time Issues.
7. Generate the MEX Function.
8. Review the Finish Workflow Page.

Create a C++ MEX Source File

1. Create Source File. Using your editor, create a file with a .
2. Add Required Header Files. For C++ MEX functions, add these header files.
3. Using Convenience Definitions.
4. Define MexFunction Class.
5. Define operator()
6. Add Member Function to Check Arguments.
7. Implement Computation.
8. Call MEX Function.

Depending on your operating system, you will right-click on the MEX file, select “Open With” and select either MATLAB Macintosh Dynamically Linked Subroutines, WordPerfect Macro Editor Expound File, mexReader Multimedia File, or a similar software program from the installed programs on your PC.

Create C Source MEX File

1. The ability to write C or C++ source code. You create these files with the MATLAB Editor.
2. Compiler supported by MATLAB. For an up-to-date list of supported compilers, see the Supported and Compatible Compilers website.
3. Functions in the C Matrix API and the C MEX API.
4. mex build script.

To call a MEX file, put the file on your MATLAB® path. Then type the name of the file, without the file extension. If you have MEX file source code, see Build C MEX Function for information about creating the executable function.

Create Source File Open MATLAB Editor, create a file, and document the MEX file with the following information. Add the C/C++ header file, mex. h , containing the MATLAB API function declarations. Save the file on your MATLAB path, for example, in c:/work , and name it arrayProduct.

From within your MATLAB® code, you can directly call external C/C++ code, also called custom code or legacy code. To call C/C++ functions, use coder. ceval . The code generator integrates your C/C++ code into the C/C++ code generated from MATLAB.

Explanation: MEX files are one of the kinds of file modes available in MATLAB. They are saved with a . mex extension. These files help in the association of C source files into the programs written in MATLAB.

To create an m-file, choose New from the File menu and select Script. This procedure brings up a text editor window in which you can enter MATLAB commands. To save the m-file, simply go to the File menu and choose Save (remember to save it with the ‘. m’ extension).

Steps Open up MATHWORKS MATLAB and press the New Script button. Type your function name. Type the inputs of your function in between the parenthesis. Comment on what each input is. Type in the operation you want your program to do using your inputs. Use an fprintf statement to output the result of your equation.

To write scripts (or programs) in MATLAB you should use a text editor. MATLAB has an integrated text editor which is very good and is highly recommended since it provides syntax highlighting and programs can be run and debugged directly from it. To open the editor, simply select the “New Script” from the top menu bar.

How to Write a User-defined Function in MATLAB How to Open a Function File. Open the MATLAB software on your computer. Get to Know the MATLAB Interface. Once you’ve opened a new script file, you should see the above interface. Writing Your Function in a Script File. How to Save and Run the User-defined Functions. Congratulation.

MATLAB:User-defined Function. MATLAB has a feature that lets you create a user-defined function inside a text file . The file itself will determine how many inputs the function can accept, what they are called locally, how many outputs can be returned, and what they are called locally.