[R] indexing matrices with dimnames?

[Michael A. Miller]

I've got a covariance matrix that I'd like to index using the
dimnames:

> vcov1
              n0            x0             s            n1            n2
n0   82.43824759  1.839505e-02 -4.975196e-01  2.882394e+03 -2.615986e-01
x0    0.01839505  6.134010e-03 -7.695922e-04 -6.373946e+01  6.086321e-03
s    -0.49751964 -7.695922e-04  9.638943e-03  3.406594e+02 -3.173671e-02
n1 2882.39407745 -6.373946e+01  3.406594e+02  1.036195e+08 -9.361243e+03
n2   -0.26159863  6.086321e-03 -3.173671e-02 -9.361243e+03  8.506608e-01

I'd like to select particular elements by name, rather than
numeric index.  For example, vcov1[1,1] returns 82.43824759.  Is
there a way to use the dimnames to extract the n0,n0 element?

Thanks, Mike
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