e=matrix([[1,0,0],[-4,1,0],[1, 4 ,1]])
print e
e.det()

If det()=1 then it is said to be as singular matrix upper triangular cannot be non singular matrix by changing the diagonal elements we can prove that it is non singular

Strang-1.5-2-U (last edited 2010-12-17 05:14:20 by sree123)