Example

> root2on2 = sqrt(2)/2
 root2on2 =
    0.707
> M = [ root2on2, root2on2,0; root2on2, root2on2, 0; 0,0,1]
 M =
    0.707      0.707          0  
    0.707      0.707          0  
        0          0          1  
> R = schur(M)
 R =
   t            z            
> new=  schord(R,1,3)
 new =
   t            z            
> new.t
-1.11e-16          0          0  
        0          1          0  
        0          0       1.41  
> new.z
   -0.707          0      0.707  
    0.707          0      0.707  
        0          1          0 
> new.z*new.t*new.z'
    0.707      0.707          0  
    0.707      0.707          0  
        0          0          1