Padé approximation of time delays
[num,den] = padecoef(T,N)
[num,den] = padecoef(T,N) returns
Nth-order Padé approximation of the continuous-time
delay T in transfer function form. The row vectors
the numerator and denominator coefficients in descending powers of s.
Class support for input T:
float: double, single
Input T support floating-point values of
 Golub, G. H. and C. F. Van Loan Matrix Computations, 3rd ed. Johns Hopkins University Press, Baltimore: 1996, pp. 572–574.