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The
AST_RATE
function can be used to find the rate of change of any Mapping output
with respect to any Mapping input, at a given input position. The method
used produces good accuracy (typically a relative error of 10E-10 or
less) but may require the Mapping to be evaluated 100 or more times.
An estimate of the second derivative is also produced by this function.
Next: Reporting Coordinate Transformations
Up: Inter-Relating Coordinate Systems (Mappings)
Previous: Inverting Mappings
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2009 Science \& Technology Facilities Council