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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, an iterative method can be used to evaluate the
inverse based only on the forward transformation.
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:
Copyright (C) 2014 Science & Technology Facilities Council
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- AST
A Library for
Handling
World Coordinate Systems
in Astronomy - Next→
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