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How to add rows and colums of zero?

Latest activity Edited by madhan ravi
on 3 Jan 2019
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

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1 Answer

Answer by madhan ravi
on 3 Jan 2019
Edited by madhan ravi
on 3 Jan 2019
 Accepted Answer

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

  3 Comments

colums can also be added with
AA =[zeros(size(A,1),2) A(:,:)]
But i dont know about the rows or a code with wich i can add both rows and colums of zero
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

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