问题描述：
想请教一个关于matlab画三维曲面图的问题
使用matlab画曲面图的问题：我这里有三组数据：
x=[3,5.05,6.7,8.8,10.1,11.8,14.33,16.64,17.7,20,21.5,24.8,26.8,28.3,30.8,32.7,35.1,36.8,39.7,41.3,43.4,45,49.1,50.9,54.1,56.5,58.8,60.9,64.1,64.9,67.5,70,72.5,74.5,76.8,80,81.8,84.9,87.1,90,92];
y=[5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5];
z=[20.81,20.48,20.53,20.3,19.8,19.2,18.95,18.82,18.68,17.99,15.75,14.81,12.5,11.88,10.57,10.22,9.88,9.43,8.88,8.3,7.77,7.48,7.29,7.02,6.85,6.77,6.54,6.01,5.88,5.68,5.55,5.41,5.38,5.21,5.12,4.8,4.64,4.52,4.44,4.31,4.28]；
想画三维曲面图.我是matlab初学者,尝试了很多次.
使用matlab画曲面图的问题：我这里有三组数据：
x=[3,5.05,6.7,8.8,10.1,11.8,14.33,16.64,17.7,20,21.5,24.8,26.8,28.3,30.8,32.7,35.1,36.8,39.7,41.3,43.4,45,49.1,50.9,54.1,56.5,58.8,60.9,64.1,64.9,67.5,70,72.5,74.5,76.8,80,81.8,84.9,87.1,90,92];
y=[5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5];
z=[20.81,20.48,20.53,20.3,19.8,19.2,18.95,18.82,18.68,17.99,15.75,14.81,12.5,11.88,10.57,10.22,9.88,9.43,8.88,8.3,7.77,7.48,7.29,7.02,6.85,6.77,6.54,6.01,5.88,5.68,5.55,5.41,5.38,5.21,5.12,4.8,4.64,4.52,4.44,4.31,4.28]；
想画三维曲面图.我是matlab初学者,尝试了很多次.
问题解答：
我来补答
三维曲面实际是张网格,如下：
也就是说,如果你X、Y是向量,则Z必须是矩阵,Z中每个元素就是网格的交点.如果X向量长度为a,Y向量长度为b,则Z应该是a*b矩阵,这样才能对应起来.matlab中mesh或者surf函数即是如此,最常用的一个形式,mesh(X, Y, Z),其中X为m维向量,Y为n维向量,则Z为n*m矩阵（注意与上段所说不同,类似转置了）.网格交点坐标为[X(j),Y(i),Z(i,j)].你给的数据,X、Y、Z是长度相等的向量,只能画曲线.如下 ：
代码为：
plot3(x, y, z);
grid on;
label('x');
label('y');
label('z');
也就是说,如果你X、Y是向量,则Z必须是矩阵,Z中每个元素就是网格的交点.如果X向量长度为a,Y向量长度为b,则Z应该是a*b矩阵,这样才能对应起来.matlab中mesh或者surf函数即是如此,最常用的一个形式,mesh(X, Y, Z),其中X为m维向量,Y为n维向量,则Z为n*m矩阵（注意与上段所说不同,类似转置了）.网格交点坐标为[X(j),Y(i),Z(i,j)].你给的数据,X、Y、Z是长度相等的向量,只能画曲线.如下 ：
代码为：plot3(x, y, z);
grid on;
label('x');
label('y');
label('z');
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