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Description:
A PolyMap
is a form of
Mapping which performs a general polynomial transformation. Each output
coordinate is a polynomial function of all the input coordinates. The coefficients
are specified separately for each output coordinate. The forward and inverse
transformations are defined independantly by separate sets of coefficients. If no
inverse transformation is supplied, the default behaviour is to use an iterative
method to evaluate the inverse based only on the forward transformation (see
attribute
IterInverse).
Constructor Function
Inheritance
The
PolyMap class inherits from the Mapping class.
Attributes
In addition to
those attributes common to all Mappings, every PolyMap also has the following
attributes:

IterInverse: Provide an iterative inverse transformation?

NiterInverse: Maximum number of iterations for iterative inverse

TolInverse: Target relative error for iterative inverse
Functions
In addition to
those functions applicable to all Objects, the following functions may also be applied
to all Mappings:
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 ←Prev
 AST
A Library for Handling
World
Coordinate Systems
in Astronomy  Next→
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