particle-filter

The current examples are in the form of scripts. To make easier and more interactive for users of the library it would help to have notebooks demonstrating these examples. For now the notebooks would go under examples folder under branch 2.0 where porting to Python 3+ is happening.

Be conservative about the changes necessary to the core of DAPPER.

ATM, this requires pretending variable-length state or obs are fixed-length. This enables using np.ndarrays without hassle, but includes overhead.

• Is "pretending" compatible with all DA methods?
• How should RMSEs be calculated?

not sure how to do this...

statistically, these pure virtual methods need to allow for the requested arguments. The compiler warnings do get annoying though.

How can we override pure virtual functions? It would request that only one "version" of the function be defined?