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add linear filter utility function.

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Roman Zeyde
2014-08-14 08:56:09 +03:00
parent 35f077982b
commit 787b356dd0
3 changed files with 12 additions and 13 deletions
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10
tests/test_sigproc.py
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@@ -26,12 +26,10 @@ def test_linreg():
def test_filter():
f = sigproc.Filter(b=[1], a=[1])
x = range(10)
y = list(f(x))
assert [float(i) for i in x] == y
y = sigproc.lfilter(b=[1], a=[1], x=x)
assert (np.array(x) == y).all()
f = sigproc.Filter(b=[0.5], a=[1, -0.5])
x = [1] + [0] * 10
y = list(f(x))
assert y == [0.5 ** (i+1) for i in range(len(x))]
y = sigproc.lfilter(b=[0.5], a=[1, -0.5], x=x)
assert list(y) == [0.5 ** (i+1) for i in range(len(x))]