Example

> a = rand(6,6)
 a =
 matrix columns 1 thru 6
    0.707      0.927      0.558      0.537      0.299      0.411  
    0.798      0.316      0.108      0.699      0.703      0.356  
    0.366     0.0293      0.207      0.589      0.485       0.65  
     0.67      0.188     0.0663      0.431       0.43      0.443  
    0.235      0.841      0.959       0.12      0.536      0.233  
    0.573        0.8      0.769      0.113      0.365      0.336  

> norm(a)*norm(inv(a))
      185
> rcond(a)
   0.0054
> 1/rcond(a)
      185