Reordering matrix in R

I have this matrix with relationships across metafounders and years. However the matrix is disordered, let's say:

> g
     1998 2010 1970
1998 0.90 0.67 0.83
2010 0.67 0.92 0.52
1970 0.83 0.52 0.95

I would like to sort this matrix in ascending order, i.e. the cell corrresponding to [1970,1970] should go on top left.

This can be done using a loop but it is tricky. In R this is easy using sorted indices:

> g1=g[order(rownames(g)),order(colnames(g))]
> g1
     1970 1998 2010
1970 0.95 0.83 0.52
1998 0.83 0.90 0.67
2010 0.52 0.67 0.92