I think it's ambiguously worded but I tried to follow your directions as precisely as I could:
format short g
% Define A with 2 rows and 9 columns
A=[1 3 7 9 4 5 3 2 4; 2 3 1 3 4 5 9 2 4]
% Define B
B = rand(size(A))
% Poster says "Based on the value particular vaue in colomn 1
% how can I find corresponding value in B?
% For example when I have a value of 9 in then how can I look for corresponding value
% in colomn 2?"
% Find a particular value in A's column 1.
% The location of that value was not specified by the poster.
% Let's say that you want the value in the first row of column 1 of A.
value = A(1,1) % = 1 for this example.
% Now assume that value we want that value from the corresponding row (1)
% of matrix B but in column 2. In other words B(1, 2)
output = B(value, 2)
