def test_kbd():
M = 100
w = mdct.windows.kaiser_derived(M, beta=4.)
assert numpy.allclose(w[:M//2] ** 2 + w[-M//2:] ** 2, 1.)
with pytest.raises(ValueError):
mdct.windows.kaiser_derived(M + 1, beta=4.)
assert numpy.allclose(
mdct.windows.kaiser_derived(2, beta=numpy.pi/2)[:1],
[numpy.sqrt(2)/2])
assert numpy.allclose(
mdct.windows.kaiser_derived(4, beta=numpy.pi/2)[:2],
[0.518562710536, 0.855039598640])
assert numpy.allclose(
mdct.windows.kaiser_derived(6, beta=numpy.pi/2)[:3],
[0.436168993154, 0.707106781187, 0.899864772847])
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