[R] dimnames and solve

[Giovanni Marchetti]

If I have a covariance matrix V 
for example 
> V = var(trees)
> V
           Girth   Height    Volume
Girth   9.847914 10.38333  49.88812
Height 10.383333 40.60000  62.66000
Volume 49.888118 62.66000 270.20280

I woul like that the inverse (i.e. the concentration matrix) 
had the same dimnames. But  I get instead 
 > solve(V)
              [,1]        [,2]        [,3]
Girth   1.71516635  0.07801175 -0.33476574
Height  0.07801175  0.04190776 -0.02412188
Volume -0.33476574 -0.02412188  0.07110330

I would like to know if this is a feature or a mistake.

Thank you to all. 

   -- Giovanni
< Giovanni M. Marchetti >
Dipartimento di Statistica, Univ. di Firenze   Phone:  +39 055 4237 204
viale Morgagni, 59                             Fax:    +39 055 4223 560
I 50134 Firenze, Italy                         email:  gmm at ds.unifi.it