pykelihood.kernels.

trigonometric

trigonometric(X, a, b, c)

Trigonometric kernel function.

\[y = a + b \cdot \cos(2\pi X) + c \cdot \sin(2\pi X)\]

Parameters:

• X (array-like) – Rescaled input vector per period of interest.

• a (float) – Constant term.

• b (float) – Coefficient for the cosine term.

• c (float) – Coefficient for the sine term.

Returns:

Trigonometric kernel output.

Return type:

array-like