A1= matrix([[0,0,0,1],[0,0,2,0],[0,3,0,0],[4,0,0,0]])
print A1.inverse()
print "\n"
A2= matrix([[1,0,0,0],[-1/2,1,0,0],[0,-2/3,1,0],[0,0,-3/4,1]])
print A2.inverse()
print "\n"
var('a,b,c,d')
A3= matrix([[a,b,0,0],[c,d,0,0],[0,0,a,b],[0,0,c,d]])
print A3.inverse()

Kreyszig- 1.6-4-U (last edited 2010-12-17 10:51:24 by 172)