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: x : array-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: