My code is keep plotting the wrong data

Question

Peter 2022-7-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755185-my-code-is-keep-plotting-the-wrong-data

评论： Star Strider 2022-7-7

I have a 9 coloumns by 150 rows matrix and I have chosen three coloumns from it to form my new 3 comloumns matrix, so I chose second to be my Z (hight) and 8 and 9 to be my x and y respectively.

M = TEST(:,[8;9;2])

surfl(M)

So, now I have a 3x150 Matrix and idealy it is 3 coloumns where first is X, second is Y and third is Z. Whenever I use surf. comand it plots wrong data and I am sure when I pick a plotted point it is all wrong. I do not know what to do to fix it.

and I do not want to plot a mathematical function I already have X Y and Z, and when I separate them, the code gives me an error that Z must be a matrix not vector, while it is obviously a matrix. I do not know how to solve it.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2022-7-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755185-my-code-is-keep-plotting-the-wrong-data#answer_1002125

在 MATLAB Online 中打开

Perhaps —

TEST = randn(150,9);

M = TEST(:,[8 9 2]);

x = M(:,1);

y = M(:,2);

z = M(:,3);

L = size(M,1);

xv = linspace(min(x), max(x), L);

yv = linspace(min(y), max(y), L);

[Xm,Ym] = ndgrid(xv, yv);

Zm = griddata(x,y,z,Xm,Ym);

figure

surf(Xm, Ym, Zm)

grid on

xlabel('X')

ylabel('Y')

zlabel('Z')

This should work with your data. It would help to have it to be certain.

.

2 个评论
显示无隐藏无

Peter 2022-7-7

It worked Thank you so much :)

Star Strider 2022-7-7

My pleasure!

If my Answer helped you solve your problem, please Accept it!

.

请先登录，再进行评论。

Answer 2

Jonas 2022-7-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1755185-my-code-is-keep-plotting-the-wrong-data#answer_1002075

may the scatter3() command is suffiecient to visualize your data, you interpolate (e.g. interp3) your XYZ data to generate more points and use surf() after that