Normalize numerator/denominator of a continuous-time transfer function.
If values of b are too close to 0, they are removed. In that case, a BadCoefficients warning is emitted.
- b: array_like
Numerator of the transfer function. Can be a 2d array to normalize multiple transfer functions.
- a: array_like
Denominator of the transfer function. At most 1d.
- num: array
The numerator of the normalized transfer function. At least a 1d array. A 2d-array if the input num is a 2d array.
- den: 1d-array
The denominator of the normalized transfer function.
Coefficients for both the numerator and denominator should be specified in descending exponent order (e.g.,
s^2 + 3s + 5would be represented as
[1, 3, 5]).