perhaps
doc slice
If you actually want the data in a 2d matrix: define the plane as a function, let's call it S, through the volume and then extract it:
S = ao + a1x + a2y + a3z;
Define the parameters a0-3 and then define all of the indices that correspond to this plane within the bounds of the volume and use
meshgrid or ndgrid
to generate a full list of sub-indices. Convert them to linear indices using
sub2ind
and extract the information. Or, if memory isn't an issue, you can just define a logical volume with the only true values being the ones on the plane defined by the constraints of your plane function.
