Hello World

Overview

In this trivial example, we introduce the reader to printing a line from the mex-file. The general print function from mex-function is mexPrintf. That being said, please note that fprintf also works just fine. So we’ll start here.

The following script results in a, “Hello World” output in the console.

C Code

In the C-script, we start off by including the header-file for the mex-functions. We then define the gateway function and start printing the results.

// Including header-file
#include "mex.h"

// Defining gateway function
void mexFunction(int nlhs, mxArray *plhs[], 
                 int nrhs, const mxArray *prhs[])
{
    // printing
    printf("Hello World \n");
}

MATLAB Code

In the Matlab script, we straight up compile the mex-file using the keyword, “mex”. Note that since the script is rather straightforward, there is no need for additional linking. Once the compilation is completed, we call the function.

%% Aim: Printing hello world

%% Basic setup
clc; clear; close all;

%% Compiling
mex HelloWorld.c

%% Calling mex-function
HelloWorld()