How to apply a low-pass or high-pass filter to an array in Matlab?

Question

Is there an easy way to apply a low-pass or high-pass filter to an array in MATLAB? I\'m a bit overwhelmed by MATLAB\'s power (or the complexity of mathematics?) and need an

Answer 1

You can design a lowpass Butterworth filter in runtime, using butter() function, and then apply that to the signal.

fc = 300; % Cut off frequency
fs = 1000; % Sampling rate

[b,a] = butter(6,fc/(fs/2)); % Butterworth filter of order 6
x = filter(b,a,signal); % Will be the filtered signal

Highpass and bandpass filters are also possible with this method. See https://www.mathworks.com/help/signal/ref/butter.html