astshim.test Namespace Reference

Classes
class	MappingTestCase
class	ObjectTestCase

Functions
	makePolyMapCoeffs (nIn, nOut)
	makeTwoWayPolyMap (nIn, nOut)
	makeForwardPolyMap (nIn, nOut)

Function Documentation

makeForwardPolyMap()

astshim.test.makeForwardPolyMap	(		nIn,
			nOut )

Make an astshim.PolyMap suitable for testing

The forward transform is the same as for `makeTwoWayPolyMap`.
This map does not have a reverse transform.

The equation is chosen for the following reasons:
- It is well defined for any positive value of nIn, nOut.
- It stays small for small x, to avoid wraparound of angles for
  SpherePoint endpoints.

Definition at line 309 of file test.py.

makePolyMapCoeffs()

astshim.test.makePolyMapCoeffs	(		nIn,
			nOut )

Make an array of coefficients for astshim.PolyMap for the following
equation:

fj(x) = C0j x0^2 + C1j x1^2 + C2j x2^2 + ... + CNj xN^2
where:
* i ranges from 0 to N=nIn-1
* j ranges from 0 to nOut-1,
* Cij = 0.001 (i+j+1)

Definition at line 262 of file test.py.

makeTwoWayPolyMap()

astshim.test.makeTwoWayPolyMap	(		nIn,
			nOut )

Make an astshim.PolyMap suitable for testing

The forward transform is as follows:
fj(x) = C0j x0^2 + C1j x1^2 + C2j x2^2 + ...
        + CNj xN^2 where Cij = 0.001 (i+j+1)

The reverse transform is the same equation with i and j reversed
thus it is NOT the inverse of the forward direction,
but is something that can be easily evaluated.

The equation is chosen for the following reasons:
- It is well defined for any positive value of nIn, nOut.
- It stays small for small x, to avoid wraparound of angles for
  SpherePoint endpoints.

Definition at line 283 of file test.py.