The function has two components, y[1] decreasing and y[2] increasing.
For
0 &le t < t_relax y[1] decreases exponentially from 1 to 0 y[2] increases exponentially from 0 to 1For
t < 0 and t &ge t_relax y[1] = 0 y[2] = 1i.e. for negative t y takes its asymptotic values.
function relaxation extends Icons.Function; input Real t "relative time"; input Real t_char "charcteristic time"; input Real beta(min = 2) "power of exponent"; output Real[2] y "relaxation function {decreasing, increasing}"; end relaxation;