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.help xy2xy Jun99 "Slalib Package"
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SUBROUTINE slXYXY (X1,Y1,COEFFS,X2,Y2)
- - - - - -
X Y X Y
- - - - - -
Transform one [X,Y] into another using a linear model of the type
produced by the slFTXY routine.
Given:
X1 d x-coordinate
Y1 d y-coordinate
COEFFS d(6) transformation coefficients (see note)
Returned:
X2 d x-coordinate
Y2 d y-coordinate
The model relates two sets of [X,Y] coordinates as follows.
Naming the elements of COEFFS:
COEFFS(1) = A
COEFFS(2) = B
COEFFS(3) = C
COEFFS(4) = D
COEFFS(5) = E
COEFFS(6) = F
the present routine performs the transformation:
X2 = A + B*X1 + C*Y1
Y2 = D + E*X1 + F*Y1
See also slFTXY, slPXY, slINVF, slDCMF
P.T.Wallace Starlink 5 December 1994
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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