Hi, As PSTricks (which I prefer) is not yet well integrated, I decided to learn Metapost starting with a simple code.
\starttext \startMPcode numeric xmin, xmax, ymin, ymax; xmin := -2.5; xmax := 2.5; ymax :=2.5 ;ymin:=-2.5; u := 2cm; vardef f(expr x) = -x*x+1 enddef; xinc := 0.001; path pts_f; pts_f := (xmin,f(xmin))*u for x=xmin+xinc step xinc until xmax+xinc: .. (x,f(x))*u endfor; path axe_x,axe_y; path screen; screen=(xmin,ymin)*u--(xmax,ymin)*u--(xmax,ymax)*u--(xmin,ymax)*u--cycle; axe_x = (xmin,0)*u -- (xmax,0)*u; axe_y = (0,ymin)*u -- (0,ymax)*u; drawarrow axe_x; drawarrow axe_y; draw pts_f withpen pencircle scaled 1; clip currentpicture to screen; \stopMPcode \stoptext Are there any routines with Metafun to improve this code? thank you, Fabrice
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