MATLAB: Zero padding

how zero padding is done in matlab with matlab code

Refer to padarray function.

It means you add a layer of pixels all the way around the image that have value 0. This is done by padarray() in the Image Processing Toolbox.

Try this trick:

matrix2x2(3,3) = 0; % Add a row of zeros.

Then to turn the 5x2 into a 5x4:

b = rand(5,2)
array5x4 = padarray(b,[0,2],0, 'post')