If you have a 3-D matrix, and you want just a single X-Z slice, you probably need a mix of indexing and either shiftdim or permute or squeeze to shift your data into the first two dimensions. For example:
d = rand(260,260,258);
s = d(:,10,:); % Grab the 10th slice
size(s) % This will be [260 x 1 x 258]
s1 = squeeze(s); % "squeeze" out the middle singleton dimension
size(s1)
figure
imagesc(s1)
% Alternatively
s2 = permute(s,[1 3 2]); % swap the second and third dimensions, so the singleton dimension is last
size(s2)
figure
imagesc(s2)
% Alternatively
s3 = shiftdim(s,2); % Shift the dimensions twice, so the singleton dimension ends up at the end.
size(s3)
s4 = s3'; % Transpose to swap the two remaining dimensions.
size(s4)
figure
imagesc(s3)
