sampling

Hello everyone. I have a sensor that I am continuously reading data from, at a constant rate, using python. Looking at the data there is obviously noise in it (bounces around when it should be zero or a constant value). After googling for 2 days I've not been able to find a way to remove the...

Alright, so I have a sinus-signal with A = 1, F = 3Hz. 3 Hz means it repeats itself 3 times/second. Then I have a sample frequency of 5 Hz, and if you do theoretical calculations, you get Falias = 5-3 = 2Hz. My problem? I'm not sure how it should be plotted on the actual graph? (the sample...