surfC with 4 vectors

2011 9 28
1 个回答
回答已采纳
8 次查看（30 天）

0 个投票

Hello, Quick question : is it possible to make surfc works with vectors ? I have 4 vectors (x,y,z & c for the color) of the same length (1 point per quadruple xyzc ) but I don't understand how to turn them into matrix as surfc asks me. The xyz points are uniformly spaced. Any idea ?

请先登录，再回答此问题。

 采纳的回答

Grzegorz Knor
Grzegorz Knor 2011-9-28

0 个投票

Use reshape function, or interpolate the data:
http://www.mathworks.com/help/techdoc/ref/triscatteredinterp.html

5 个评论
显示 3更早的评论 隐藏 3更早的评论

Kevin
Kevin 2011-9-28
I don't really understand how "reshape" can help me here. What do you mean ?
And, since my points are already uniformly spaced, I don't want to do an interpolation.
Grzegorz Knor
Grzegorz Knor 2011-9-28
I don't know how you create your data, but look at example:
% create an example surface plot:
[X,Y,Z] = peaks(30);
surfc(X,Y,Z,abs(Z))
% convert to single columns:
x = X(:);
y = Y(:);
z = Z(:);
c = abs(z);
% surfc(x,y,z,c) <- error
% create a surface plot using reshape function:
figure
surfc(reshape(x,30,30),reshape(y,30,30),reshape(z,30,30),reshape(c,30,30))
Kevin
Kevin 2011-9-28
Ah nice ! But that works only if you can do a square matrix. And of course, well, I can't ! :)
Grzegorz Knor
Grzegorz Knor 2011-9-28
Matrices can be any size, but you need to know it.
[x,y] = meshgrid(-2:.1:2, -2:.2:2);
x = x(:);
y = y(:);
z = x.*exp(-x.^2 - y.^2);
c = abs(z);
surfc(reshape(x,21,41),reshape(y,21,41),reshape(z,21,41),reshape(c,21,41))
Kevin
Kevin 2011-9-28
It works thanks but I had to add a value because the lenght of my data was a prime number...

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 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