MATLAB: How to insert a column with zeros in the second column of a mxn matrix

insert zero column

Hello, I would like to insert a column with zeros in the second column of a (mxn) matrix, after which the matrix would be a mx(n+1) matrix. It would be really grateful, if someone could help me on this. Thank you.

Best Answer

Brute force:

 A = [1 2 3; 4 5 6; 7 8 9]
 A = [zeros(size(A,1),1) A];
 A(:,[1 2]) = A(:,[2 1])

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Simple approach(Consider matrix A):

A(:,[1 2 8 9])=A(:,[8 9 1 2])

MATLAB: Inserting vector to a mxn Matrix

clc; clear all ;
N = 5 ;
iwant = [];
for i = 1:10
    A = rand(1,N) ;         % your A matrix which changes 
    k = rand(1,1) ;         % your constant which changes 
    iwant = [[A,k] ; iwant] ; % matrix which you want
end
% Print array knowing maximum value 
Max = iwant(3,end) ;  % Pick a arbitrary maximum value
% Get the row position for maximum value
[r] = find(iwant(:,end)==Max) ;
% Print tthe array
iwant(r,1:end-1)

Best Answer

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MATLAB: How to swap columns of a matrix?

MATLAB: Inserting vector to a mxn Matrix

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