Program for calculation of the response of strictly proper SISO systems
to arbitrary input by the convolution integral:

*/num = numerator polynomial coefficients of transfer function

*/den = denominator polynomial
coefficients of transfer function
(Coefficients of 'num' and 'den' are specified as a row vector, in
decreasing powers of 's')

*/t = row vector of time points (specified by the user)

*/u = vector of input values at the time points contained in t

*/y = calculated response