function x (t) return 1.1*t*t+0.4*t;
function y (t) return 0.9*t*t+2.0*t;

svg_open  (100,100,50,50,10);
svg_kurve ( x,y ,-3, 1.1, 'zoom=10','sf=red' );
t = -1;
svg_punkt (x(t),y(t),"sd=0.5","sf=blue");
svg_text  (x(t),y(t),"t = -1");
t =  0;
svg_punkt (x(t),y(t),"sd=0.5","sf=blue");
svg_text  (x(t),y(t),"t = 0");
t =  1;
svg_punkt (x(t),y(t),"sd=0.5","sf=blue");
svg_text  (x(t),y(t),"t = 1");
svg_close '/tmp/filu/test_reca/test_kurven/parabel_param.svg'; // default stdout