freqz
freqz(b, a)
freqz(b, a, w)
Calculates the frequency response of a filter given its numerator and denominator coefficients.
Try it yourself:
| $1 | freqz([1, 2], [1, 2, 3])
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| $2 | freqz([1, 2], [1, 2, 3], [0, 1])
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| $3 | freqz([1, 2], [1, 2, 3], 512)
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