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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 
  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.
 Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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Coordinate Systems
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