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LSST Data Management Base Package
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Classes | Functions
lsst.meas.algorithms.pcaPsfDeterminer Namespace Reference

Classes

class  PcaPsfDeterminerConfig
 
class  PcaPsfDeterminerTask
 

Functions

 numCandidatesToReject (numBadCandidates, numIter, totalIter)
 
 candidatesIter (psfCellSet, ignoreBad=True)
 

Function Documentation

◆ candidatesIter()

lsst.meas.algorithms.pcaPsfDeterminer.candidatesIter ( psfCellSet,
ignoreBad = True )
Generator for Psf candidates.

This allows two 'for' loops to be reduced to one.

Parameters
----------
psfCellSet : `lsst.afw.math.SpatialCellSet`
   SpatialCellSet of PSF candidates.
ignoreBad : `bool`, optional
   Ignore candidates flagged as BAD?

Yields
-------
cell : `lsst.afw.math.SpatialCell`
   A SpatialCell.
cand : `lsst.meas.algorithms.PsfCandidate`
  A PsfCandidate.

Definition at line 629 of file pcaPsfDeterminer.py.

629def candidatesIter(psfCellSet, ignoreBad=True):
630 """Generator for Psf candidates.
631
632 This allows two 'for' loops to be reduced to one.
633
634 Parameters
635 ----------
636 psfCellSet : `lsst.afw.math.SpatialCellSet`
637 SpatialCellSet of PSF candidates.
638 ignoreBad : `bool`, optional
639 Ignore candidates flagged as BAD?
640
641 Yields
642 -------
643 cell : `lsst.afw.math.SpatialCell`
644 A SpatialCell.
645 cand : `lsst.meas.algorithms.PsfCandidate`
646 A PsfCandidate.
647 """
648 for cell in psfCellSet.getCellList():
649 for cand in cell.begin(ignoreBad):
650 yield (cell, cand)
651
652

◆ numCandidatesToReject()

lsst.meas.algorithms.pcaPsfDeterminer.numCandidatesToReject ( numBadCandidates,
numIter,
totalIter )
Return the number of PSF candidates to be rejected.

The number of candidates being rejected on each iteration gradually
increases, so that on the Nth of M iterations we reject N/M of the bad
candidates.

Parameters
----------
numBadCandidates : `int`
    Number of bad candidates under consideration.

numIter : `int`
    The number of the current PSF iteration.

totalIter : `int`
    The total number of PSF iterations.

Returns
-------
return : `int`
    Number of candidates to reject.

Definition at line 43 of file pcaPsfDeterminer.py.

43def numCandidatesToReject(numBadCandidates, numIter, totalIter):
44 """Return the number of PSF candidates to be rejected.
45
46 The number of candidates being rejected on each iteration gradually
47 increases, so that on the Nth of M iterations we reject N/M of the bad
48 candidates.
49
50 Parameters
51 ----------
52 numBadCandidates : `int`
53 Number of bad candidates under consideration.
54
55 numIter : `int`
56 The number of the current PSF iteration.
57
58 totalIter : `int`
59 The total number of PSF iterations.
60
61 Returns
62 -------
63 return : `int`
64 Number of candidates to reject.
65 """
66 return int(numBadCandidates*(numIter + 1)//totalIter + 0.5)
67
68