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# DynamicMatrixTransform

class astropy.coordinates.DynamicMatrixTransform(matrix_func, fromsys, tosys, priority=1, register_graph=None)

  Bases: `BaseAffineTransform`

  A coordinate transformation specified as a function that yields a 3 x 3 cartesian transformation matrix.

  This is similar to, but distinct from StaticMatrixTransform, in that the matrix for this class might depend on frame attributes.

  Parameters:
    matrix_func `python:callable()`

      A callable that has the signature `matrix_func(fromcoord, toframe)` and returns a 3 x 3 matrix that converts `fromcoord` in a cartesian representation to the new coordinate system.

    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:
    `TypeError`

      If `matrix_func` is not callable