Does a dynamic sparse matrix have _outerIndexPtr(), _innerIndexPtr() and _valuePtr() attributes? and if not, then I guess I have to convert it to a normal sparse matrix and then use these attributes, but then is there a way to do that without first copying it to a new matrix and then deleting the dynamic sparse matrix ?? This would be useful for very large matrices.
Thanks

Another question: Is insertion into a dynamic sparse matrix thread safe ?

Two threads cannot write to the same column of a column major DynamicSparseMatrix. Todo so you have to manually use a mutex.

Regarding your first question, you got it right.

Hi ggael,
Thanks for the reply. Regarding my first question, Can we convert DynamicSparseMatrix to SparseMatrix directly without copying?

nope, they are totally different kind of objects.