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import graph;
size(10cm,0);
real xmin=-4,xmax=4;
real ymin=-2,ymax=10;
real f(real x) {return x^2;}
marker cross=marker(scale(4)*rotate(45)*cross(4),
markuniform(new pair(real t) {return Scale((t,f(t)));},
xmin,xmax,round(2*(xmax-xmin))),1bp+red);
draw(graph(f,xmin,xmax,n=400),linewidth(1bp),cross);
ylimits(-2.5,10,Crop);
xaxis(Label("$x$",position=EndPoint, align=NE),xmin=xmin,xmax=xmax,
Ticks(scale(.7)*Label(align=E),NoZero,begin=false,beginlabel=false,
end=false,endlabel=false,Step=1,step=.25,
Size=1mm, size=.5mm,pTick=black,ptick=gray),Arrow);
yaxis(Label("$y$",position=EndPoint, align=NE),ymin=ymin,ymax=ymax,
Ticks(scale(.7)*Label(),NoZero,begin=false,beginlabel=false,
end=false,endlabel=false,Step=1,step=.25,Size=1mm,size=.5mm,
pTick=black,ptick=gray),Arrow);
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