Make rotation matrix immutable and cache the value
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@ -2,11 +2,13 @@
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Geometric transforms
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"""
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from typing import Sequence
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from functools import lru_cache
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import numpy
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from numpy.typing import NDArray
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@lru_cache
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def rotation_matrix_2d(theta: float) -> NDArray[numpy.float64]:
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"""
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2D rotation matrix for rotating counterclockwise around the origin.
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@ -17,8 +19,10 @@ def rotation_matrix_2d(theta: float) -> NDArray[numpy.float64]:
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Returns:
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rotation matrix
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"""
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return numpy.array([[numpy.cos(theta), -numpy.sin(theta)],
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arr = numpy.array([[numpy.cos(theta), -numpy.sin(theta)],
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[numpy.sin(theta), +numpy.cos(theta)]])
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arr.flags.writeable = False
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return arr
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def normalize_mirror(mirrored: Sequence[bool]) -> tuple[bool, float]:
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