How to show surface plot of 2D data?

10 次查看（过去 30 天）
Steven
Steven 2019-12-10
评论： Star Strider 2019-12-10
Hi.
I have a set of data points, C at each x and y (for many cases). In 2D, the plot looks simply like this:
So this is a sample plot for one x. There are similar plots for other x values as well.
What I want is some kind of surface plot. How can I get it? I tried to use surf and contour, but they need their z to be a matrix, not an array.
For instance, the data looks like this:
% set1
x = [1 1 1 1];
y = [1 3 5 16];
C = [100 400 200 500];
% set2
x = [2 2 2 2];
y = [4 7 8 13];
C = [200 500 700 100];
Thank you

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2019-12-10
Try this (with your own vectors):
x = rand(10,1); % Create Data
y = rand(10,1); % Create Data
z = rand(10,1); % Create Data
[X,Y] = ndgrid(sort(x), sort(y)); % Create Interpolation Grids
Z = griddata(x, y, z, X, Y); % Interpolate ‘z’
figure
surf(X, Y, Z)
hold on
stem3(x, y, z, 'filled')
hold off
grid on
Experiment to get different results.
  9 个评论
显示 7更早的评论
Steven
Steven 2019-12-10
编辑：Steven 2019-12-10
Unfortuantely some of them are not of the same size, but some of them are! But it works for those that are though :)
P.S., I edited the original post to include the data.
Thanks again
Star Strider
Star Strider 2019-12-10
As always, my pleasure!
You can make them all the same size with the interp1 or interp2 functions. It is slightly more work, however you can then use all your data.
For example, to extend ‘x1’, ‘y1’, and ‘C1’ to each have a length of 7:
x1i = x1(1)*ones(1,7);
y1i = interp1((1:numel(x1)), y1, linspace(1, numel(x1), numel(x1i)));
C1i = interp1((1:numel(x1)), C1, linspace(1, numel(x1), numel(x1i)));
You could probably create a function to do this.

请先登录，再进行评论。

更多回答（0 个）

类别

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

标签

Community Treasure Hunt

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

Start Hunting!

Translated by