/* example7.ch */
#include <control.h>

int main() {
    array double num[1] = {9}, 
                 den[3] = {1, 2, 9},
                 k[1][1];
    int np, nz;
    CControl sys;
    CPlot plot;

    sys.model("tf", num, den);
    np = sys.size('p');
    nz = sys.size('z');

    array double complex p[np], z[nz];

    k = sys.dcgain();
    sys.sgrid(1);
    sys.pzmap(&plot, p, z);

    printf("k = %f\n", k);
    printf("p = %f\n", p);
    printf("z = %f\n", z);

    return 0;
}