## How to add rows and colums of zero?

Asked by Shubham Mohan Tatpalliwar

### Shubham Mohan Tatpalliwar (view profile)

on 3 Jan 2019
Latest activity Edited by madhan ravi

on 3 Jan 2019

### madhan ravi (view profile)

I want to compare two matrices for that the number of rows and columns should be similar
The two matrices to be compared are as follows
A=[3 4 5; 3 4 5; 3 4 5]
B=[1 2 3 4 5 ; 1 2 3 4 5; 1 2 3 4 5]
Consider the numbers also as their position in the matrix for ease of understanding
That means we need two rows and two colums of zero at the start
the expected matrix of is as follows
A=[0 0 3 4 5;0 0 3 4 5;0 0 3 4 5]
P.S. The number of colums and rows of zero are not always the same. that could be varying like 3 colums and 1 rows and further

### madhan ravi (view profile)

on 3 Jan 2019
Edited by madhan ravi

### madhan ravi (view profile)

on 3 Jan 2019

A = padarray(A,[abs(size(B,1)-size(A,1)) abs(size(B,2)-size(A,2))],0,'pre') % requires image processing toolbox
Gives:
A =
0 0 3 4 5
0 0 3 4 5
0 0 3 4 5

Shubham Mohan Tatpalliwar

### Shubham Mohan Tatpalliwar (view profile)

on 3 Jan 2019
colums can also be added with
AA =[zeros(size(A,1),2) A(:,:)]
Shubham Mohan Tatpalliwar

### Shubham Mohan Tatpalliwar (view profile)

on 3 Jan 2019
But i dont know about the rows or a code with wich i can add both rows and colums of zero

### madhan ravi (view profile)

on 3 Jan 2019
Did you try my answer?
n=2; % no of zeros(rows & columns) to be padded
A=[zeros(n,size(B,2));zeros(size(A,1),n) A]
Gives:
A =
0 0 0 0 0
0 0 0 0 0
0 0 3 4 5
0 0 3 4 5
0 0 3 4 5