lsst.astshim
14.0-6-g52c7625
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Provide an iterative inverse transformation? (bool)
This attribute indicates whether the inverse transformation of the PolyMap should be implemented via an iterative Newton-Raphson approximation that uses the forward transformation to transform candidate input positions until an output position is found which is close to the required output position. By default, an iterative inverse is provided if, and only if, no inverse polynomial was supplied when the PolyMap was constructed.
The NIterInverse and TolInverse attributes provide parameters that control the behaviour of the inverse approcimation method.
Maximum number of iterations for the iterative inverse transformation. (int)
This attribute controls the iterative inverse transformation used if the IterInverse attribute is non-zero.
Its value gives the maximum number of iterations of the Newton-Raphson algorithm to be used for each transformed position. The default value is 4. See also attribute TolInverse.
Target relative error for the iterative inverse transformation. (double)
This attribute controls the iterative inverse transformation used if the IterInverse attribute is non-zero.
Its value gives the target relative error in teh axis values of each transformed position. Further iterations will be performed until the target relative error is reached, or the maximum number of iterations given by attribute NIterInverse is reached.
The default value is 1.0E-6.