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Description:
The forward transformation of a UnitNormMap subtracts the specified centre and then
transforms the resulting vector to a unit vector and the vector norm. The output contains one more
coordinate than the input: the initial
Nin outputs are in the same order as the input; the final output is
the norm.
The inverse transformation of a UnitNormMap multiplies each component of the provided vector by
the provided norm and adds the specified centre. The output contains one fewer coordinate than
the input: the initial Nin inputs are in the same order as the output; the final input is the
norm.
UnitNormMap enables radially symmetric transformations, as follows:
-
apply a UnitNormMap to produce a unit vector and norm (radius)
-
apply a one-dimensional mapping to the norm (radius), while passing the unit vector unchanged
-
apply the same UnitNormMap in the inverse direction to produce the result
Constructor
Function
Inheritance
The UnitNormMap class inherits from the
Mapping class.
Attributes
The UnitNormMap class does not define any new attributes
beyond those which are applicable to all Mappings.
Functions
The UnitNormMap class
does not define any new routines beyond those which are applicable 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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