stella.util
Class GuiderMagnitudes

java.lang.Object
  stella.util.GuiderMagnitudes

public class GuiderMagnitudes
extends Object

We fit data from a file to obtain a general photometric solution to the STELLA guiding camera. The function we fit is

   mag_inst=mag+a0*x+a1*(B-V)+a2.
   

The data is provided in an ascii-file, the first column is the instrumental magnitude, second is the V magnitude from the catalog, third the color index, fourth and last the airmass. The format is compliant with the output of MirrorData#Extinction.

Field Summary

private VectorG[]	aircolor The measurement points.
private VectorG	dmag The measurements, i.e.
private GeneralLinearRegression	glr The general linear least squres solver.

Constructor Summary

GuiderMagnitudes(File columns)
The argument is the data file.

Method Summary

static void	main(String[] arg) We read the input data from the file provided.
private VectorG	solve() Solves for the zero point, the k and epsilon.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

dmag

private VectorG dmag

The measurements, i.e. inst. mag minus catalog mag.

aircolor

private VectorG[] aircolor

The measurement points. First index is airmass, second B-V.

glr

private GeneralLinearRegression glr

The general linear least squres solver.

Constructor Detail

GuiderMagnitudes

public GuiderMagnitudes(File columns)

The argument is the data file.

Method Detail

solve

private VectorG solve()

Solves for the zero point, the k and epsilon.

main

public static void main(String[] arg)

We read the input data from the file provided.