i>EasySpin</i> are not written in MATLAB, but in C. These parts come pre-compiled with the EasySpin distribution, and most often you don't have to do anything.
</p>

<p>
However, in some cases it might be necessary to recompile them for your platform using a C compiler.
For this, run the following in the MATLAB command window:
</p>

<pre class="matlab">
easyspin compile
</pre>

<p>
This calls <a href="https://www.mathworks.com/help/matlab/ref/mex.html">mex</a> to compile the <code>*.c</code> files in the <c