\documentclass{article} \usepackage{mpgraphics} \begin{document} \begin{mpdisplay} LaTeX_unitlength := 1.0pt; w := 60*LaTeX_unitlength; h := 40*LaTeX_unitlength; numeric xmin, xmax, ymin, ymax; xmin := 1/4; xmax := 6; ymax := 1/xmin; u := 1cm; vardef f(expr x) = 1/x enddef; xinc := 0.1; path pts_f; pts_f := (xmin,f(xmin))*u for x=xmin+xinc step xinc until xmax: .. (x,f(x))*u endfor; path hline[], vline[]; hline0 = (0,0)*u -- (xmax,0)*u; vline0 = (0,0)*u -- (0,ymax)*u; vline0.5 = (0.5,0)*u -- (0.5,ymax)*u; vline4 = (4,0)*u -- (4,ymax)*u; fill buildcycle(hline0, vline0.5, pts_f, vline4) withcolor 0.8[blue,white]; draw hline0; draw vline0; % draw axes draw (0.5,0)*u -- vline0.5 intersectionpoint pts_f; draw (4,0)*u -- vline4 intersectionpoint pts_f; draw pts_f withpen pencircle scaled 2; label.bot(btex $x$ etex, (0.9xmax,0)*u); label.lft(btex $y$ etex, (0,0.9ymax)*u); label.urt(btex Hello $f(x)$ etex, (0.5,f(0.5))*u); \end{mpdisplay} \end{document}