Bases: astropy.modeling.polynomial.OrthoPolynomialBase
2D Chebyshev polynomial of the 1st kind.
It is defined as
P_{n_m}(x,y) = \sum C_{n_m} T_n(x) T_m(y)
Parameters: | x_degree : int
y_degree : int
x_domain : list or None
y_domain : list or None
x_window : list or None
y_window : list or None
param_dim : int
**params : dict
fixed: a dict :
tied: dict :
bounds: dict : eqcons: list :
ineqcons : list
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Methods Summary
deriv(x, y, *params) | Derivatives with respect to the coefficients. |
Methods Documentation
Derivatives with respect to the coefficients.
This is an array with Chebyshev polynomials:
Tx0Ty0 Tx1Ty0...TxnTy0...TxnTym
Parameters: | x : ndarray
y : ndarray
params : throw away parameter
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Returns: | result : ndarray
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