TraceSet¶

class pydl.pydlutils.trace.TraceSet(*args, **kwargs)[source]¶

Implements the idea of a trace set.

Attributes:

func : str: Name of function type used to fit the trace set.
xmin : float-like: Minimum x value.
xmax : float-like: Maximum x value.
coeff : array-like: Coefficients of the trace set fit.
nTrace : int: Number of traces in the object.
ncoeff : int: Number of coefficients of the trace set fit.
xjumplo : float-like: Jump value, for BOSS readouts.
xjumphi : float-like: Jump value, for BOSS readouts.
xjumpval : float-like: Jump value, for BOSS readouts.
outmask : array-like: When initialized with x,y positions, this contains the rejected points.
yfit : array-like: When initialized with x,y positions, this contains the fitted y values.

This class can be initialized either with a set of xy positions, or with a trace set HDU from a FITS file.

Attributes Summary

`has_jump`	`True` if jump conditions are set.
`nx`	Number of x values.
`xRange`	Range of x values.
`xmid`	Midpoint of x values.

Methods Summary

`xnorm`(xinput, jump)	Convert input x coordinates to normalized coordinates suitable for input to special polynomials.
`xy`([xpos, ignore_jump])	Convert from a trace set to an array of x,y positions.

Attributes Documentation

Methods Documentation

xnorm(xinput, jump)[source]¶

Convert input x coordinates to normalized coordinates suitable for input to special polynomials.

Parameters:	xinput : array-like Input coordinates. jump : `bool` Set to `True` if there is a jump.
Returns:	array-like Normalized coordinates.

xy(xpos=None, ignore_jump=False)[source]¶

Convert from a trace set to an array of x,y positions.

Parameters:	xpos : array-like, optional If provided, evaluate the trace set at these positions. Otherwise the positions will be constructed from the trace set object iself. ignore_jump : `bool`, optional If `True`, ignore any jump information in the `tset` object
Returns:	:func:`tuple` of array-like The x, y positions.