import graph_pi;

size(10cm,0);

real f(real x){return x^2;};

xlimits(-2, 2);
ylimits(0, 4.25);

draw(graph(f, -2, 2));

/*MODgraph_pi.asy.html#graphpoint(...)MOD*/
graphpoint(Label("$M$",align=NW), f, 1.5);
graphpoint("$P$", f, 1, extendy=true, px=Dotted+red, py=Dotted+blue);
graphpoint("$N$", f, -1, draw=onX, px=Dotted+red);
graphpoint("$Q$", f, sqrt(3), extendx=true);

xaxis(BottomTop(), LeftTicks());
yaxis(Ticks());
yaxis(LeftRight(), Ticks());