how to select certain elements from a matrix?

A=[1,2,3,4], B=[90,0,40,0;0,0,10,60;55,15,0,10;0,15,5,0]

Hi everyone.. I want to select indexes of only one zero from each row and respective column. please help me in writing matlab code for this problem. Thanks in Advance

Answer 1

[David Sanchez]

B=[90,0,40,0;
    0,0,10,60;
    55,15,0,10;
    0,15,5,0];

[col row]=find(B==0);
A= [row col] % coordinates of your zero-elements

A =

       1     2
       1     4
       2     1
       2     2
       3     3
       4     1
       4     4

[David Sanchez]

In you just want the coordinates of the first zero in each row:

B=[90,0,40,0;
    0,0,10,60;
    55,15,0,10;
    0,15,5,0];
First_zero_coordinates = zeros(size(B,1),2);
for k=1:size(B,1)
    col = find(B(k,:)==0,1);
    First_zero_coordinates(k,:) = [ k col]; 
end

First_zero_coordinates =

       1     2
       2     1
       3     3
       4     1

[Uet]

Thank you very much sir, is there any way so that i can delete repeated rows as you mentioned in A? as you can see there are double entries from 1st, 2nd and 4th rows. I want to select one from each

[Uet]

Thanks alot Sir.. Much obliged