How can I remove noise from my graph?

I recently conducted an experiment involving water oscillations and I have a lot of noise. What are some methods to remove it? Thank you for your time.

Answer 1

[Christoph F.]

The most straightforward option is using a filter to remove the noise. This works if the noise has a different spectral content than the signal (e.g. signal is bandlimited, noise is white -> a lowpass filter can be used to reduce the amount of noise).

Functions for digital filter design and application can be found in the signal processing toolbox.

Answer 2

[Image Analyst]

For 1-D signals, you might try sgolayfilt() or movmean() or smooth(). For 2-D signals (images) see https://users.soe.ucsc.edu/~milanfar/publications/journal/ModernTour.pdf