Sparse matrix deep copy

[ArmoredCat]

Is there currently a way to get a deep copy of a SparseStore instance?

[ArmoredCat]

Current way I am doing it is by filling the diagonals of a new matrix with 1.0 and then multiplying with the matrix you want to copy, but there probably is a more efficient way. Also tried the nonzero() method and just setting it manually but that takes the same amount of time surprisingly.

[apete]

I'd say using nonzeros() is the best option. A recent change/addition (have to build and use a snapshot version) allow to specify the initial capacity (number of nonzeros) of the receiver. That can make a big difference.

[ArmoredCat]

That worked great, slashed my runtime completely, thank you!

[apete]

If you built a snapshot version from the develop branch, then there is now a copy function in the factory class. In addition to what (I assume) you have now this also bypasses some internally synchronized code. Should speed things up further.

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