/* p4-20a.ch */
#include <control.h>

int main() {
    array double num[1] = {16}, 
                 den[3] = {1, 3, 16};
    CControl sys;
    CPlot plot;

    sys.model("tf", num, den);
    sys.grid(1);
    sys.step(&plot, NULL, NULL, NULL);

    return 0;
}