The model relates two sets of [x,y] coordinates as follows. Naming the elements of coeffs:

  coeffs[0] = A
  coeffs[1] = B
  coeffs[2] = C
  coeffs[3] = D
  coeffs[4] = E
  coeffs[5] = F

the present routine performs the transformation:

  x2 = A $+$ B $\ast$ x1 $+$ C $\ast$ y1
  y2 = D $+$ E $\ast$ x1 $+$ F $\ast$ y1

palXy2xy ( double x1, double y1, double coeffs[6], double $\ast$x2, double $\ast$y2)

x1 = double (Given)

y1 = double (Given)

coeffs = double[6] (Given)

x2 = double (Returned)

y2 = double (Returned)

palFitxy, palPxy, palInvf and palDcmpf