merging two matrix into a single one

Hi,

I have two matrices.

j =

     1     2     3
     0     0     0
     0     0     0

k =

     0     0     0
     0     0     0
     4     1     7

I need the following matrix

l =

     1     2     3
     0     0     0
     4     1     7

How to do that? Thanks

Answer 1

[Matt Fig]

J = [1 2 3;0 0 0;0 0 0];
K = [0 0 0;0 0 0;4 1 7]; 
L = max(J,K)

Answer 2

[Walter Roberson]

J = [1 2 3;0 0 0;0 0 0];
K = [0 0 0;0 0 0;4 1 7]; 
L = J + K;

or

L = J; L(K<>0) = K(K<>0);

[Mohammad Golam Kibria]

Its also right.Thanks

[Matt Fig]

Walter, what is this: <>

[Matt Fig]

@Mohammad, the idea is that the "correct" approach might be unknown to us because of the type of example posted. Two approaches might yield the same results on one set of data and not another...

[Andrei Bobrov]

L(K~=0) = K(K~=0)

Hi Mohammad! "<>" -> "~=" analog in other languages

[Walter Roberson]

Oops... the symbolics use <> and I've been answering questions about those again.