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:

tuple() of array-like

The x, y positions.