> does clear() set all values to 0 for dense and sparse matrices? And if so:
> Is that efficient for a freshly generated sparse matrix?
Why would you want to clear freshly generated sparse matrix ?
I thought it is semantically zero anyway ...
Yes. But the problem in my case is: I really don't know whether I created a sparse or dense matrix, as that is defined by some typedef which I change depending on the use of the final binary. After that, I read in data and I want all values which are not present in the datafile to be zero. In the case of dense matrices, I would need to clear() it. That's why I wondered whether clear()ing a sparse matrix does any harm.
Thanks,
Markus