if i have 256x256 matrix and i want to zero padding it to 512x512 how can i do ?

I have file name k_im which has 256x256 matrix and i want to do zero padding it to matrix 512x512 help me write a code pls tyvm.

Answer 1

[the cyclist]

If you have the Image Processing Toolbox, you can use padarray.

If not,

paddedM = zeros(512:512);
paddedM(129:384,129:384) = M;

(assuming you want equal padding on all sides, and I did my math right).

Answer 2

[James Tursa]

If you just want it padded on two sides, then simply

k_im = your 256x256 matrix
k_im(512,512) = 0; % pad 0's out to (512,512) element