用mesh画图时问题

银杏树之舞

在MATLAB7.1中输入下列代码

s(1,i)是关于x，z的二元二次矩阵函数，

修改前错误：
x=0:0.1:1;z=0:1:75;
qq=s(1,1);
mesh(x,z,qq)
运行后没有出现图像只有一个坐标轴请高手解答下
??? Error using ==> set
View [azimuth elevation] must be a two element vector.
Error in ==> mesh at 128
      set(cax,'View',y);
Warning: Z must not be a scalar or vector, not rendering surface.
Warning: Z must not be a scalar or vector, not rendering surface.
Warning: Z must not be a scalar or vector, not rendering surface.
Warning: Z must not be a scalar or vector, not rendering surface.
Warning: Z must not be a scalar or vector, not rendering surface.

修改后错误:
X=0:0.1:1;Z=0:1:75;
[x,z]=meshgrid(X,Z);
mesh(x,z,s(1,1))
运行后没有出现图像只有一个坐标轴请高手解答下
出现这错误提示：
??? Error using ==> graph3d.surfaceplot.surfaceplot>localConstructor
Invalid input arguments
Error in ==> mesh at 135
           hh = graph3d.surfaceplot(x,y,z,'FaceColor',fc,'EdgeColor','flat', ...
想得到一个关于x,z,s(1,1)的三维曲线图。

liuyalong008

1. X=0:0.1:1;Z=0:1:75;
   
2. [x,z]=meshgrid(X,Z);
   
3. s=x.^2+z.^2;
   
4. mesh(x,z,s)
   
5. hold on
   
6. plot3(x(1,1),z(1,1),s(1,1),'o','markersize',8)

复制代码

银杏树之舞

我刚才试了一下，用你的代码确实可以，不过把s函数换成我的就不行了：s(1,i)=
297/10*(2829640491/4+522185200*x)/(79905/2+31000*x)+297/10*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-684381625628649003/1374389534720
你在看看:)

liuyalong008

银杏树之舞 发表于 2012-2-7 16:44
我刚才试了一下，用你的代码确实可以，不过把s函数换成我的就不行了：s(1,i)=
297/10*(2829640491/4+522185 ...

请写清楚s 的具体表达式   维数！！！

相逢一笑

这是计算s(1,i)的表达式
syms x z;
for i=1:1:4
EM=(z-zb)/p;
s(1,i)=E(1,i)*(ET+EM-a(1,i)*T);
disp('s(1,i)=');
disp(s(1,i));
end
这是运算结果：
s(1,i)=
297/10*(2829640491/4+522185200*x)/(79905/2+31000*x)+297/10*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-684381625628649003/1374389534720

s(1,i)=
215*(2829640491/4+522185200*x)/(79905/2+31000*x)+215*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-3142569

s(1,i)=
131*(2829640491/4+522185200*x)/(79905/2+31000*x)+131*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-11451103/5

s(1,i)=
69*(2829640491/4+522185200*x)/(79905/2+31000*x)+69*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-6229251/5

相逢一笑

这是s(1,i)的计算表达式
syms x z;
for i=1:1:4
EM=(z-zb)/p;
s(1,i)=E(1,i)*(ET+EM-a(1,i)*T);
disp('s(1,i)=');
disp(s(1,i));
end
这是运算结果：
s(1,i)=
297/10*(2829640491/4+522185200*x)/(79905/2+31000*x)+297/10*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-684381625628649003/1374389534720

s(1,i)=
215*(2829640491/4+522185200*x)/(79905/2+31000*x)+215*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-3142569

s(1,i)=
131*(2829640491/4+522185200*x)/(79905/2+31000*x)+131*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-11451103/5

s(1,i)=
69*(2829640491/4+522185200*x)/(79905/2+31000*x)+69*(z-((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x))/(-9436142375/2-62/3*(90+500*x)^3+69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*(348100-(90+500*x)^2)-69*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*(500-500*x)+131*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)*((90+500*x)^2-8100)-65500*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2*x+1398375/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)/(79905/2+31000*x)-10905/2*((139035-69000*x)*(500-500*x)+500*(196500*x+1965)*x+527625/2)^2/(79905/2+31000*x)^2)*((69*(2829640491/4+522185200*x)/(79905/2+31000*x)-6229251/5)*(500-500*x)*(250*x+505)+500*(131*(2829640491/4+522185200*x)/(79905/2+31000*x)-11451103/5)*x*(165+250*x)+1398375/4*(2829640491/4+522185200*x)/(79905/2+31000*x)-2907890731971300489975/549755813888)-6229251/5

相逢一笑

本来想直接用for循环mesh出四幅曲线图，可是总出错，就想分开算，可是mesh还是有问题

银杏树之舞

谢谢liuyalong008 ，用你的程序，一开始总出错，后来知道矩阵得用.*和./，修改后就出来了:victory:

huzishuai

学习了，哈哈