>> A= rand(4,4)

A =

    0.8147    0.6324    0.9575    0.9572
    0.9058    0.0975    0.9649    0.4854
    0.1270    0.2785    0.1576    0.8003
    0.9134    0.5469    0.9706    0.1419

>> A= randi(9, 4, 4)

A =

     4     6     7     6
     9     1     7     2
     8     8     7     7
     9     9     4     1

>> [L, U= lu(A)
 [L, U= lu(A)
     |
Error: The expression to the left of the equals sign is not a valid target
for an assignment.
 
>> [L, U]= lu(A)

L =

    0.4444    0.6944    1.0000         0
    1.0000         0         0         0
    0.8889    0.8889    0.5767    1.0000
    1.0000    1.0000         0         0


U =

    9.0000    1.0000    7.0000    2.0000
         0    8.0000   -3.0000   -1.0000
         0         0    5.9722    5.8056
         0         0         0    2.7628

>> 
>> L*U

ans =

     4     6     7     6
     9     1     7     2
     8     8     7     7
     9     9     4     1

>> A

A =

     4     6     7     6
     9     1     7     2
     8     8     7     7
     9     9     4     1

>> [L, U, P]= lu(A);
>> L

L =

    1.0000         0         0         0
    1.0000    1.0000         0         0
    0.4444    0.6944    1.0000         0
    0.8889    0.8889    0.5767    1.0000

>> U

U =

    9.0000    1.0000    7.0000    2.0000
         0    8.0000   -3.0000   -1.0000
         0         0    5.9722    5.8056
         0         0         0    2.7628

>> P

P =

     0     1     0     0
     0     0     0     1
     1     0     0     0
     0     0     1     0

>> L*U

ans =

     9     1     7     2
     9     9     4     1
     4     6     7     6
     8     8     7     7

>> A

A =

     4     6     7     6
     9     1     7     2
     8     8     7     7
     9     9     4     1

>>