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# StaticMatrixTransform

class astropy.coordinates.StaticMatrixTransform(matrix, fromsys, tosys, priority=1, register_graph=None)

  Bases: `BaseAffineTransform`

  A coordinate transformation defined as a 3 x 3 cartesian transformation matrix.

  This is distinct from DynamicMatrixTransform in that this kind of matrix is independent of frame attributes. That is, it depends only on the class of the frame.

  Parameters:
    matrix numpy:array_like or `python:callable()`

      A 3 x 3 matrix for transforming 3-vectors. In most cases will be unitary (although this is not strictly required). If a callable, will be called with no arguments to get the matrix.

    fromsys class

      The coordinate frame class to start from.

    tosys class

      The coordinate frame class to transform into.

    priority `python:float` or `python:int`

      The priority if this transform when finding the shortest coordinate transform path - large numbers are lower priorities.

    register_graph `TransformGraph` or `python:None`

      A graph to register this transformation with on creation, or `None` to leave it unregistered.

  Raises:
    `ValueError`

      If the matrix is not 3 x 3