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verbatimtex
\documentclass{article}
\usepackage{palatino}
\usepackage{concmath}
\usepackage{ccfonts}
\begin{document}
etex
def marktic( expr Where, IsVertical, Size ) =
begingroup
pair low, hig;
if IsVertical:
low = ( xpart Where, (ypart Where) - 0.5*Size );
hig = ( xpart Where, (ypart Where) + 0.5*Size );
else:
low = ( (xpart Where) - 0.5*Size, ypart Where );
hig = ( (xpart Where) + 0.5*Size, ypart Where );
fi;
draw low--hig
endgroup
enddef;
beginfig(1);
numeric u, xsize, ysize, ticlen, xstep, yamp, yshift;
path o.dtriang, xax, yax;
picture previouspic;
u = 8mm;
xsize = 9u;
ysize = 2.7u;
ticlen = 0.2u;
yamp = 1.8u;
xstep = 1.6u;
yshift = 6.0u;
z0 = origin;
z1 = ( xsize, 0 );
xax = z0--z1;
z2 = ( 0, -ysize );
z3 = ( 0, ysize );
yax = z2--z3;
z4 = ( 0, -yamp );
z40 = ( 0, yamp );
z5 = ( xstep, yamp );
z50 = ( xstep, 0 );
z6 = ( 2*xstep, -yamp );
z60 = ( 2*xstep, 0 );
z7 = ( 3*xstep, yamp );
z70 = ( 3*xstep, 0 );
z8 = ( 4*xstep, -yamp );
z80 = ( 4*xstep, 0 );
z9 = ( 5*xstep, yamp );
z90 = ( 5*xstep, 0 );
o.dtriang = z4--z5--z6--z7--z8--z9;
drawarrow xax;
drawarrow yax;
marktic( z4, false, ticlen );
marktic( z40, false, ticlen );
marktic( z50, true, ticlen );
marktic( z60, true, ticlen );
marktic( z70, true, ticlen );
marktic( z80, true, ticlen );
marktic( z90, true, ticlen );
label.bot( btex $x$ etex, z1 );
label.bot( btex 1 etex, z50 );
label.bot( btex 2 etex, z60 );
label.bot( btex 3 etex, z70 );
label.bot( btex 4 etex, z80 );
label.bot( btex 5 etex, z90 );
previouspic = currentpicture;
draw previouspic shifted (0,-yshift);
label.lft( btex $\frac{d\, f}{d\, x}$ etex scaled 1.35, (0,ysize-yshift) );
label.lft( btex $f$ etex, z3 );
draw o.dtriang withpen pencircle scaled 2pt;
label.lft( btex 2 etex, z40 );
label.lft( btex -2 etex, z4 );
endfig;
verbatimtex
\end{document}
etex
end.
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