How can i add a 2D matrix of zeros on top of a 3D matrix of logicals

Hi,

I've subtracted the bottom z values of a 3D matrix (ffilter) and now i want to add a 2D matrix in the z direction on top, to create a new matrix (ffilter2).

if true
  ffilter2=ffilter2(:,:,(1:617));
[N,v,b]=size(ffilter2)
c=zeros(N,v,1);
ffilter2=ffilter2(:,:,(c:618));
end

I have a 2D matrix of zeros (size = x_of3D_matrix;y_of3D_matrix,1). And I want to "add" this to the 3D matrix so this will result in an 3D matrix with an extra layer (of zeros) in the z direction (on top). I probably didn't formulate this the proper way. But I hope somebody understands what I'm asking. All the help is really appreciated!

Thank you.

Answer 1

[Rik]

You can use the cat function:

ffilter2=ffilter2(:,:,(1:617));
[N,v,b]=size(ffilter2)
c=zeros(N,v,1,'like',ffilter2);%or c=false(N,v,1);
ffilter2=cat(3,ffilter2,c);

[David van Nederpelt]

Thank you