Question

怎样用matlab画等高线

Answer 1

用contour可以绘制二维等高线。contour3绘制三维等高线。
举个栗子
a=[1480 1500 1550 1510 1430 1300 1200 980
1500 1550 1600 1550 1600 1600 1600 1550
1500 1200 1100 1550 1600 1550 1380 1070
1500 1200 1100 1350 1450 1200 1150 1010
1390 1500 1500 1400 900 1100 1060 950
1320 1450 1420 1400 1300 700 900 850
1130 1250 1280 1230 1040 900 500 700
]
x=[1200 1600 2000 2400 2800 3200 3600 4000 1200 1600 2000 2400 2800 3200 3600 4000 1200 1600 2000 2400 2800 3200 3600 4000 1200 1600 2000 2400 2800 3200 3600 4000 1200 1600 2000 2400 2800 3200 3600 4000 1200 1600 2000 2400 2800 3200 3600 4000 1200 1600 2000 2400 2800 3200 3600 4000]
y=[3600 3600 3600 3600 3600 3600 3600 3600 3200 3200 3200 3200 3200 3200 3200 3200 2800 2800 2800 2800 2800 2800 2800 2800 2400 2400 2400 2400 2400 2400 2400 2400 2000 2000 2000 2000 2000 2000 2000 2000 1600 1600 1600 1600 1600 1600 1600 1600 1200 1200 1200 1200 1200 1200 1200 1200]
z=[a(1,:) a(2,:) a(3,:) a(4,:) a(5,:) a(6,:) a(7,:)]
figure(1),plot3(x,y,z,'*'),title('三维散点图')
grid on
[x1,y1]=meshgrid(0:10:5600,0:10:4800)
z1=griddata(x,y,z,x1,y1,'linear')
figure(2),mesh(x1,y1,z1),title('linear插值法'),colorbar
z1=griddata(x,y,z,x1,y1,'cubic')
figure(3),mesh(x1,y1,z1),title('cubic插值法'),colorbar
figure(4),h=contour(z1,10)
clabel(h),title('二维等高线')
figure(5),contour3(z1,10)
clabel(h),title('三维等高线')