Section: Transforms/Decompositions
y = inv(x)
Internally, the inv function uses the matrix divide operators.
For sparse matrices, a sparse matrix solver is used.
--> a = randi(zeros(3),5*ones(3))
a = 
 1 4 3 
 1 1 3 
 1 4 5 
--> b = inv(a)
b = 
    1.1667    1.3333   -1.5000 
    0.3333   -0.3333         0 
   -0.5000         0    0.5000 
--> a*b
ans = 
    1.0000         0         0 
    0.0000    1.0000         0 
         0         0    1.0000 
--> b*a
ans = 
    1.0000    0.0000         0 
         0    1.0000    0.0000 
         0         0    1.0000