func_fit

pydl.pydlutils.trace.func_fit(x, y, ncoeff, invvar=None, function_name='legendre', ia=None, inputans=None, inputfunc=None)

Fit x, y positions to a functional form.

Parameters

xarray-like

X values (independent variable).

yarray-like

Y values (dependent variable).

ncoeffint

Number of coefficients to fit.

invvararray-like, optional

Weight values; inverse variance.

function_namestr, optional

Function name, default ‘legendre’.

iaarray-like, optional

An array of bool of length ncoeff specifying free (True) and fixed (False) parameters.

inputansarray-like, optional

An array of values of length ncoeff specifying the values of the fixed parameters.

inputfuncarray-like, optional

Multiply the function fit by these values.

Returns

tuple of array-like

Fit coefficients, length ncoeff; fitted values.

Raises

KeyError

If an invalid function type is selected.

ValueError

If input dimensions do not agree.