using surf and pol2cart on matrix

6 次查看（过去 30 天）
prrrrr
prrrrr 2020-6-25
评论： Star Strider 2020-6-26
hello i have a 512x1000 matzrix
the coordinates are there divided into lines (x) as radius and columns (y) as angles. To each point in the matrix belongs a value (z).
How do I get the polar coordinates into cartesian coordinates (pol2cart). And can it plot at the end (with surf?)?
I would like to get in principle from my picture A the picture B
EDIT Forgot Code Example:
angles = (0:pi/8:2*pi)';
radii = 1:10;
[X, Y] = pol2cart(angles, radii)
  1 个评论
Adam Danz
Adam Danz 2020-6-25
Are the angles vector and the radii vector supposed to be different lengths?
How do those values plot a circle?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2020-6-25
编辑：Star Strider 2020-6-25
The matrix you have is actually the ‘Z’ matrix. You need to create separate radius and angle matrices of the same size (use ndgrid or meshgrid for that, and be aware that their outputs are not the same), then use all three of those matrices as arguments to pol2cart. You will likely need to experiment a bit.
See: Plotting an exponential exp(-x), in 3D? for an example.
EDIT — (25 Jun 2020 at 23:17)
Using code example, try something like this:
Z = rand(512,1000); % Create 'Z'
angles = linspace(0, 2*pi, size(Z,2));
radii = linspace(1, 10, size(Z,1));
[A, R] = meshgrid(angles, radii);
[X, Y, Z] = pol2cart(A, R, Z);
figure
surf(X, Y, Z)
shading('interp')
grid on
.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Resizing and Reshaping Matrices 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by