How to set sample values to zero

I need to find samples of my noisy signal that are below the noise amplitude and set those to zero. Thank you for any help

Answer 1

[Voss]

Use x(x < threshold) = 0, where x is your signal and threshold is your noise amplitude. Or x(abs(x) < threshold) = 0, if you meant the amplitude of the signal is below the noise amplitude.

Here's a concrete example:

% random signal
x = 0.25*rand(1,20);

plot(x,'-o');
hold on

% set values below 0.1 to 0:
x(x < 0.1) = 0;

plot(x,'.-');
legend({'original' 'new'})