| FreeMat
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Section: Transforms/Decompositions
Inverts the argument matrix, provided it is square and invertible. The syntax for its use is
y = inv(x)
 Internally, the inv function uses the matrix divide operators. For sparse matrices, a sparse matrix solver is used. 
Here we invert some simple matrices
--> a = randi(zeros(3),5*ones(3))
a = 
 5 3 3 
 4 1 3 
 5 2 5 
--> b = inv(a)
b = 
    0.0909    0.8182   -0.5455 
    0.4545   -0.9091    0.2727 
   -0.2727   -0.4545    0.6364 
--> a*b
ans = 
    1.0000    0.0000   -0.0000 
    0.0000    1.0000         0 
    0.0000    0.0000    1.0000 
--> b*a
ans = 
    1.0000    0.0000         0 
    0.0000    1.0000         0 
    0.0000   -0.0000    1.0000