Class Rotation

source code

object --+
         |
        Rotation

Rotation class that implements an orthogonal linear transformation, one for each dimension.

By default reach Rotation instance provides a different "random" but fixed rotation. This class is used to implement non-separable test functions, most conveniently via FFWrapper.RotatedFitness.

Example:

>>> import cma, numpy as np
>>> R = cma.Rotation()
>>> R2 = cma.Rotation() # another rotation
>>> x = np.array((1,2,3))
>>> print(R(R(x), inverse=1))
[ 1.  2.  3.]

See: FFWrapper.RotatedFitness