Parameters

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* added simple operations to references, e.g. you can specify that a given
parameter is twice the value of another;
* fixed bug with complex nested references.

are:

* addition of parameter set validation against a predefined schema;
* Python 3 support;
* NumPy and SciPy are no longer essential, although additional functionality is
available if they are installed;
* added support for YAML-format parameter files;
* added support for opening remote parameter files where you are accessing the
web via a proxy server;
* added export of parameter sets in LaTeX;
* addition of references, i.e. specifying one parameter by reference to another.

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The first version of Parameters was part of NeuroTools.