清空筛选条件
清空筛选条件

2D Matrix revolution

1 次查看（过去 30 天）
Felipe Bayona
Felipe Bayona 2019-11-18
评论： darova 2019-11-19
Hi community
How can I revolutionize a 2D matrix around an axis to obtain a solid?
Supose a NxN matrix. In each row are the points of a kind of gaussian curve with less amplitude and higher width. Plotting this surface shows something like a half bell that decays to zero. (See Bottom)
I want to obtain a 3D image revolutionazing that matrix, so the solid looks like a complete bell, or a mexican hat.
Notice that each curve in the matrix rows are different.
I have already try with cylinder(), but i can't define the rotation axis, and the result is a segmented solid.
Possible solutions so I can get the 3D image and define the rotation axis?
Thanks a lot
The surface to revolutioniye looks like this:
untitled.jpg
Cylinder shows this:
untitled.jpg
  2 个评论
darova
darova 2019-11-18
Which axis do you want to rotate?
Felipe Bayona
Felipe Bayona 2019-11-18
I would like to know the general method, where i can specify the axis. In this particular example, I need to do it around the z-axis, to obtain the 'Mexican hat'

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

darova
darova 2019-11-18
Use cylinder for each curve separately:
z = linspace(-1,1,20); % axis
r = sqrt(1-z.^2); % radius
[x,y,~] = cylinder(r,length(z)-1); % convert to cylinder system
zz = repmat(z',[1 20]); % create 2D matrix for Z matrix
surf(x,y,zz) % sphere
  4 个评论
显示 2更早的评论
darova
darova 2019-11-18
And what is the problem?
x = linspace(0,40,41);
[X,T, rc] = normalDiffusion(4, 1, 1, x, 20);
z = X(i,:); % axis
r = rc(i,:); % radius
[x,y,~] = cylinder(r,length(z)-1); % convert to cylinder system
zz = repmat(z',[1 length(r)]); % create 2D matrix for Z matrix
surf(x,y,zz) % sphere
darova
darova 2019-11-19
Maybe z and r should be switched?
z = X(i,:); % axis
r = rc(i,:); % radius

请先登录，再进行评论。

Philippe Lebel
Philippe Lebel 2019-11-18
  1 个评论
Felipe Bayona
Felipe Bayona 2019-11-18
This only alows to rotate a y=f(x) funtion
My matrix is composed by many curves, because my function is z=f(x,y)

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Surface and Mesh Plots 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by