[R] help with distance matrix

[Deming Mi]

Dear R users,
I have computed a diagonal distance matrix and it's in a matrix format (I 
did not use the dist() function).  However hclust() does not take my 
distance matrix as correct input object.  It seems that hclust() only accept 
the distance matrix from dist() as input object.  Does anybody know how to 
make my distance matrix work with hclust()?  Thank you!

Deming  Mi