Matlab , inner , outer, tensor Product

from here :http://www.mathworks.com/access/helpdesk/help/techdoc/math/f4-988203.html

outer:

u = [3; 1; 4]; v = [2 0 -1];
x = v*u 
x =        2
X = u*v
X =        6     0     -3
            2     0     -1
            8     0     -4

inner :
we often use the transform operator x' . i think it is easy for u to understand , so dont do explain.


tensor :

The Kronecker product is often used with matrices of zeros and ones to build up repeated copies of small matrices. For example, if X is the 2-by-2 matrix

X =       
1     2       
3     4

and I = eye(2,2) is the 2-by-2 identity matrix, then the two matrices

kron(X,I)

and

kron(I,X)

are

       1     0     2     0       
0     1     0     2       
3     0     4     0       
0     3     0     4

and

1     2     0     0       
3     4     0     0      
0     0     1     2      
0     0     3     4