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PermMap - Coordinate permutation Mapping   

Description:
A PermMap is a Mapping which permutes the order of coordinates, and possibly also changes the number of coordinates, between its input and output.

In addition to permuting the coordinate order, a PermMap may also assign constant values to coordinates. This is useful when the number of coordinates is being increased as it allows fixed values to be assigned to any new ones.

Constructor Function:
astPermMap

Inheritance
The PermMap class inherits from the Mapping class.

Attributes
The PermMap class does not define any new attributes beyond those which are applicable to all Mappings.

Functions
The PermMap class does not define any new functions beyond those which are applicable to all Mappings.



next up previous
Next: Plot - Provide facilities for graphical output
Up: AST Class Descriptions
Previous: PcdMap - Apply 2-dimensional pincushion/barrel distortion

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2003 Central Laboratory of the Research Councils