Deconvolves divisor out of signal, division of polynomials for n terms
calculates den^{-1} * num
Parameters : | num : array_like
denom : array_like
n : None or int
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Returns : | quot : array
rem : array
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Notes
If num is a time series, then this applies the linear filter den^{-1}. If both num and den are both lagpolynomials, then this calculates the quotient polynomial for n terms and also returns the remainder.
This is copied from scipy.signal.signaltools and added n as optional parameter.