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Why isn’t QuantExt a part of QuantLib, the two projects seem very similar.

We have chosen to use QuantExt for two practical reasons. The first one is flexibility: we want to be able to add QuantLib extensions when required for ORE without being

What about QuantLibAdjoint, can I use it with ORE?

We have not built on QuantLibAdjoint yet. However, this is another potential route of extending ORE, as well as alternative ways for fast sensitivity calculation.

Does ORE ‘compete’ with QuantLib?

Not at all! ORE builds on the work of QuantLib. And we grateful for the enormous community effort and experience that went into QuantLib which has enabled ORE.