SLA_XY2XY - Apply Linear Model to an $[\,x,y\,]$

ACTION:

Transform one $[\,x,y\,]$ into another using a linear model of the type produced by the sla_FITXY routine.

CALL:

CALL sla_XY2XY (X1,Y1,COEFFS,X2,Y2)

GIVEN:

$$[\,x,y\,]$$ X1,Y1

COEFFS D(6) transformation coefficients (see note)

RETURNED:

$$[\,x,y\,]$$ X2,Y2

NOTES:

1.

The model relates two sets of $[\,x,y\,]$ coordinates as follows. Naming the six elements of COEFFS a,b,c,d,e & f, the present routine performs the transformation:

x₂ = a + bx₁ + cy₁
y₂ = d + ex₁ + fy₁

2.

See also sla_FITXY, sla_PXY, sla_INVF, sla_DCMPF.