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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 functions 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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