Matrix data

I have a 5x5 matrix

lets say i initialise my x=tmp([1;2;4]); as my initial state i only want the first column and row 1 2 and 4 data.

I am doing a looping and how do i get the data in my loop to get column 2 row 1 2 and 4 data in my 2nd loop and the subsequent column in my subsequent looping?

I only need the row 1 2 and 4 data for each column during each increment of my loop

thanks.

Answer 1

[Chandra Kurniawan]

A = round(10*rand(5,5))
tmp = [1 2 4];
for col = 1 : 5
    B(:,col) = A(tmp,col);
end

The result :

A =

       9     4     1     9     1
       1     9     9     6     2
       4     2     6     4     1
       3     3     5     5     2
       8     1     1     4     2

B =

       9     4     1     9     1
       1     9     9     6     2
       3     3     5     5     2