spectrochempy.polynomial

polynomial(x, offset=0.0, slope=0.0, ampl=1.0, **kwargs)

Return a 1D polynomial profile.

This helper evaluates a centered polynomial using the same parameterization as the polynomialbaseline fitting shape, while also allowing an optional constant offset and linear slope for convenient signal construction.

Parameters

• x (array-like, Coord or NDDataset) – Abscissa values.

• offset (float, optional) – Constant offset added to the profile.

• slope (float, optional) – Linear slope applied around the centre of x.

• ampl (float, optional) – Global scaling factor applied to the polynomial terms.

• **kwargs – Polynomial coefficients such as c_2=..., c_3=..., etc.