From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 4 Mar 2015 21:21:30 -0500 Subject: Initial commit --- src/slalib/sun67.htx/node195.html | 114 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 src/slalib/sun67.htx/node195.html (limited to 'src/slalib/sun67.htx/node195.html') diff --git a/src/slalib/sun67.htx/node195.html b/src/slalib/sun67.htx/node195.html new file mode 100644 index 0000000..2b33ece --- /dev/null +++ b/src/slalib/sun67.htx/node195.html @@ -0,0 +1,114 @@ + + + + +SLA_XY2XY - Apply Linear Model to an + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_ZD - to Zenith Distance +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_WAIT - Time Delay +

+

+

    +
+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: +
+
+ + + + + + + + + +
X1,Y1D$[\,x,y\,]$ before transformation
COEFFSD(6)transformation coefficients (see note)
+

+
RETURNED: +
+
+ + + + + +
X2,Y2D$[\,x,y\,]$ after transformation
+

+
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. +
+
+ +next + +up + +previous +
+ Next: SLA_ZD - to Zenith Distance +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_WAIT - Time Delay +

+

+

+SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk +
+ + -- cgit