If you’re working with Fortran code and want to integrate it with MATLAB, you might come across the need to compile your Fortran file using the `mex`

function. The `mex`

function allows you to create MEX functions, which are interface programs that enable you to call Fortran code from within MATLAB. In this article, we’ll explore the general steps involved in compiling a Fortran file using `mex`

and discuss some common issues you might encounter.

**1. Prepare Your Fortran Code**

The first step is to make sure your Fortran code is properly structured and includes a function that you want to interface with MATLAB. This function will be called using the MEX interface. Ensure that your code is error-free and ready for compilation.

**2. Rename File Extension**

The Fortran code file should have a `.f`

or `.for`

extension. Either extension is valid, but for compatibility purposes, it’s recommended to use `.f`

. You can simply rename your file to have the correct extension.

**3. Define the MEX Function**

In your Fortran code, you need to define the MEX function with the proper signature. This involves creating a function that matches the MEX interface and specifying the input and output arguments.

**4. Compile Using mex**

Open MATLAB and use the `mex`

function to compile your Fortran code. You might need to provide additional compiler and linker flags to ensure proper compilation. Make sure to adjust the output name and flags according to your needs.

`mex myfortranfile.f -compatibleArrayDims -output myfortranfunction`

**5. Test Your MEX Function**

Once compiled, you can call your MEX function just like any other MATLAB function. Test it with sample data to ensure that it works as expected.

**Conclusion** – matlab fortran

Compiling Fortran code using the `mex`

function can be a powerful way to integrate your existing codebase with MATLAB. It allows you to harness the capabilities of both languages for your projects. Keep in mind that the success of the compilation process depends on the correct function definition and proper compilation flags.

**Example**

Let’s consider an example where you have a Fortran code that performs complex mathematical calculations. You want to interface this code with MATLAB for advanced analysis. By following the steps above, you can compile the Fortran code into a MEX function and utilize it within MATLAB to achieve your goals.