MATLAB: How to pad zeros to an array

pad zeros

I have an array of data of size 5.I have to pad zeros to set the size as 10.How to add zeros of size 5.Help me please…

A=[1 2 3 4 5]
A=[A zeros(1,5)]

%or

A(end+1:end+5)=0

If you want to add a dark edge (that's what the zeros will be), at the bottom and to the right:

load mandrill
[m n] = size(X); %in your case it will be [1023 1023]

X = [ [X;zeros(1,n)] zeros(m+1,1)];

At the top and to the left:

load mandrill
[m n] = size(X); %in your case it will be [1023 1023]
X = [ zeros(m+1,1) [zeros(1,n);X] ];

Plus the two other alternatives, with the same principle:

 X = [[zeros(1,n);X] zeros(m+1,1)];
 X = [ zeros(m,1) [X;zeros(1,n+1)] ];

In this simple case, you have just decreased the separation between adjacent DFT bins by a factor of 2.

y = [1 2 3 4 0 0 0 0];
ydft = fft(y);
ydft = downsample(ydft,2); 
% or ydft = ydft(1:2:end);

That will be the same as

xdft = fft(1:4);

but in general, the above won't work.