extract column from 3D meshgrid and griddata matrices

Hello,

I have a 3D meshgrid and griddata interpolation like this:

x = 0;
y = 0;
z = min(zp):dz:max(zp);
[X,Y,Z] = meshgrid(x,y,z);
u_int = griddata(xp,yp,zp,u,X,Y,Z);

Then I need to plot u_int with respect to Z:

plot(Z,u_int)

but the code gets the error:

Error using plot
Data cannot have more than 2 dimensions.

In fact Z and u_int are 3D matrices.

size(Z) 

gives

ans =

1     1   201

When I try to extract the third colum with:

ZZ = (1,1,:)

I still get a 3D matrix.

How can I transform this 3D matrix into a vector extracting the thid dimension?

Answer 1

[Walter Roberson]

See squeeze

But more likely you would just use

plot(Z(:), u_int(:))

for this very odd case where your x and y are scalars.

Answer 2

[Antonella Longo]

Sorry, I found the answer.

The reshape function has to be used.