Does a function exist (prefferably in matlab) that finds a function in noise
Sure, any least-squares fit will do that.
Curve fit won't work....try taking the fft of the data series, filter out the noise then ifft. The only thing you need to have an idea about is what type of noise is it and whether to use a high pass or low pass filter.
This will work only if the original data series is not broadband, otherwise you need to use nonlinear noise reduction (look for the LAZY algorithm).
HI, Crosson, can you explain about "LAZY alggorithm", I searched on Google, and still don't understand it's meaning.
Separate names with a comma.