Matrix Filling

hi MATLABERS,

Im stuck at this problem. I want to make a matrix that does the following:

say i have the first row of the matrix [12 14 18]. now a get a random integer and it comes out to be 14. I want to store that 14 right under the 14 like so:

[12 14 18;0 14 0]

 12 14 18

 0  14  0  
      or
12 14 18
   14 
how can i do that. please help

[Sean de Wolski]

And what do you want to do if the random integer is 59?

Answer 1

[Wayne King]

 index = find(A(1,:) == 14);
 A = cat(1,A,zeros(1,size(A,2)));
 A(2,index) = 14;

Added after Sean's point -- if the integer is not present in the row, you'll just get a row of zeros.

   index = find(A(1,:) == 59);
   A = cat(1,A,zeros(1,size(A,2)));
   A(2,index) = 59;

[Wayne King]

Sean has a very good point, note that in that case, the above will just fill with a row of zeros.

[Ahsan Khan]

thanks this works but how do i do this with a array of integers instead of just one.

ex predefined [1 2 3 4 5 6 7 8 9 10] is compared with a matrix [2 5 7;1 2 9 10;4 5 6] and the results should be as follows:

1 2 3 4 5 6 7 8 9 10

0 2 0 0 5 0 7 0 0 0

1 2 0 0 0 0 0 0 9

0 0 0 4 5 6 0 0 0