Matrix Manipulation Image Processing

I have a matrix of 100 rows and 2 columns. How to sort the first column of the matrix and write the corresponding second column elements. Please help me. Its Urgent.Thanks in Advance

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

Answer 1

[Andrei Bobrov]

A = rand(100,2); % your matrix

[~,ii] = sort(A(:,1));
out = A(ii,:);

[Jes]

Thanks a lot. It works. Could you please explain me once . Thanks

Answer 2

[James Tursa]

doc sortrows

[Jes]

Thanks