Pad array to certain size

I would like to pad my matrix x so that the resulting size of the matrix is 425x425.

How would I achieve this ?

x = randi(256,200,200);

[James Tursa]

What about the 3rd dimension? How is your overall padding supposed to work?

[raheem mian]

X is a 200x200 matrix with random integer values up to 256.

Answer 1

[SaiDileep Kola]

Hi Raheem,

This is how you can realize your required outcome,

x=randi(256,200,200); % Initial Matrix
z=zeros(425,425); %New matrix
z(1:200,1:200) = x; % Superimpose x on to appropriate position on z

[TJ]

I am looking for an answer to a similar problem,

I have a 22x1 cell array, where each cell is an n by n matrix (image) mostly around the size 20 x 20 (double values), all of the same image pixel size, 0.04 microns.

I would like to return a 22x1 cell array where each cell is an n by n matrix of equal size, using the solution above this is relatively simple. However, that would displace the real (scaled) location of each matrix. So I would like the all of the original matrices to be at the centre of the returned padded matrices.

Is there a simple solution to this?