function?high=high（xy）
x=1200:400:4000;
y=1200:400:3600;
[xy]=meshgrid（xy）;
z=[11301250128012301040900500700;
????13201450142014001300700900850;
????139015001500140090011001060950;
????15001200110013501450120011501010;
????15001200110015501600155013801070;
????15001550160015501600160016001550;
????1480150015501510143013001200980];
figure（1）;
subplot（121）;
title（‘山區地貌圖‘）
mesh（z）;
subplot（122）;