fitting.cosine¶

fitting.cosine(x, a, b, c, d=0.0)¶

A cosine with constant offset.

Parameters:	x (array) – x-values. a (float) – Amplitude. b (float) – Frequency (rad). c (float) – Phase (rad). d (float) – Offset.
Returns:	$f(x) = a \cos(2 \pi b x + c) + d$ .