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: