fchebyshev_split¶
-
pydl.pydlutils.trace.
fchebyshev_split
(x, m)[source]¶ Compute the first
m
Chebyshev polynomials, but modified to allow a split in the baseline at \(x=0\). The intent is to allow a model fit where a constant term is different for positive and negativex
.- Parameters
- xarray-like
Compute the Chebyshev polynomials at these abscissa values.
- m
int
The number of Chebyshev polynomials to compute. For example, if \(m = 3\), \(T_0 (x)\), \(T_1 (x)\) and \(T_2 (x)\) will be computed.
- Returns