monte-carlo-simulation

Currently the C++ code in freud does not ensure that r_min is non-negative (>= 0) in several classes. Values of r_min < 0 should raise an error in the constructor like this:

https://github.com/glotzerlab/freud/blob/eb2a97bac302ed45236f26e0a7e6a0346071c579/cpp/density/RDF.cc#L17-L28

This applies to classes like RDF and CorrelationFunction and other classes that deal with radial dist

The attr ranges could accept an interval of chars (according to ASCII). The attr ranges are mainly used by the plugins to define their attributes, e.g., see the attributes of this plugin.

The examples below could be

Implementing a simple Q-learning agent in Python that uses multiple technical indicators to make a decision of Buy, Sell or Hold.