summaryrefslogtreecommitdiff
path: root/info/examples/lgc2/4-2-6.mp
blob: 4bf6a0c8c9d69bf19730a449bdf32c7861da06aa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
% --- start of displayed preamble in the book ---
input graph
% --- end of displayed preamble in the book ---
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
draw begingraph(2.5in,1.75in);
setrange(origin,(100,100));
numeric p[]; path r;
for j := 0 step 10 until 100: p[j]:=0; endfor
def check(expr age) =
 if age < 100: xage:=round(age/10) * 10;
               p[xage]:=p[xage] + 1; fi
enddef;
gdata ("ages.dat",y, check((scantokens y1)););
r:=(0,0) for j := 0 step 10  until 100:
                  --(j,p[j]) endfor --(100,0);
gfill r -- cycle withcolor blue;
frame.llft;
endgraph;
endfig;
end;