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IsSimple
-
Has the Mapping been simplified?
- Description:
- This attribute indicates whether a Mapping has been simplified
by the
AST_SIMPLIFY
method. If the IsSimple value is non-zero, then the Mapping has
been simplified and so there is nothing to be gained by simplifying
it again. Indeed, the
AST_SIMPLIFY
method will immediately return the Mapping unchanged if the IsSimple
attribute indicates that the Mapping has already been simplified.
- Type:
- Integer (boolean), read-only.
- Class Applicability:
-
Mapping
-
All Mappings have this attribute.
-
Frame
-
All classes of Frame return zero for the IsSimple attribute.
This is because changes can be made to a Frame which affect the
Mapping represented by the Frame, and so there can be no
guarantee that the Mapping may not need re-simplifying. Most
non-Frame Mappings, on the other hand, are immutable and so when
they are simplified it is certain that they weill remain in a
simple state.
Next: Iwc - Include a Frame representing FITS-WCS intermediate world coordinates?
Up: AST Attribute Descriptions
Previous: IsLonAxis(axis) - Is the specified celestial axis a longitude axis?
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