Plotting fft data in matlab
<p>I am analyzing ECG data using MATLAB. The data is made up of two columns, one the time in milliseconds and the other contains the volts (mV) and is imported into MATLAB from a CSV file.</p>

<p>I use the built-in <code>fft</code> function in MATLAB (i.e <code>fft(mV)</code>). Now that I have the transformed data, I don't know how to plot it.</p>

<p>I know that I need the frequency data but I'm having trouble understanding where that comes from and what the other axis even is.</p>