How can I get at the arrays/pointers in the sparse-matrix data-structure?

If the data corresponding to a sparse matrix in MTL is stored in CRS 
format it should consist of 3 pointers,

1). *double containing the matrix non-zero values (double)
2) . *int containing the corresponding column indices
3). *int containing the corresponding row indices

I've looked in the documentation and source code but have not been able 
to find how I can access these pointers directly.  Does anybody know how 
to do this and/or have a snippet of code that does it?

Thanks,

- David
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