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extract column from 3D meshgrid and griddata matrices

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Antonella Longo
Antonella Longo 2023-10-4
回答： Antonella Longo 2023-10-4
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?

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采纳的回答

Walter Roberson
Walter Roberson 2023-10-4
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.

更多回答（1 个）

Antonella Longo
Antonella Longo 2023-10-4
Sorry, I found the answer.
The reshape function has to be used.

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