Logical indexing 3D array to get a 2D slice

I have a piece of code that calculates potential for 3D space. Now I want to extract the potential at the YOZ plane:

[X,Y,Z]=meshgrid(-500:spacing:500);
V= some calculations;
V0=V(X==0);

The problem is that V0 is a 1D vector instead of a 2D matrix. How do I correctly extract the slice?

Answer 1

[Walter Roberson]

You cannot. When you use a single parameter logical vector to index an array, the result is always a vector.

In limited circumstances you can reshape() the vector.

I suggest something more like

marginals = -500:spacing:500;
[X,Y,Z] = meshgrid(marginals);
V= some calculations;

xtarget = 0;
[~, xidx] = min(abs(marginals - xtarget));
V0 = permute(V(xidx, :, :), [2 3 1]);  %safer than squeeze()