surfC with 4 vectors

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 ?

Answer 1

[Grzegorz Knor]

Use reshape function, or interpolate the data:

http://www.mathworks.com/help/techdoc/ref/triscatteredinterp.html

[Kevin]

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]

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]

Ah nice ! But that works only if you can do a square matrix. And of course, well, I can't ! :)

[Grzegorz Knor]

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]

It works thanks but I had to add a value because the lenght of my data was a prime number...