Arc-alkali-rydberg-calculator

**This version:**
* Improved support for Hydrogen atom calculations.
* Easy installation (Linux and MacOS) via pip pip install ARC-Alkali-Rydberg-Calculator

**Notes for upgrading from old version**
If you have previously installed ARC via pip, use pip uninstall -y ARC-Alkali-Rydberg-Calculator before installing new version via pip.

Please also force ARC into using new database values for Hydrogen by deleting folder with local data with command rm -rf $HOME/.arc-data. ARC globally installed with pip can be directly loaded via from arc import * without specifying details about package location. Upon first loading of ARC, new $HOME/.arc-data folder for data memoization will be automatically created.

Note: If you want to save databases with your own extensive dipole matrix element calculations, make a backup of corresponding .npy files (all except for hydrogen!) **before** deleting and copy into .arc-data folder upon installation of the new version.

***For Windows users***: precompiled Windows package (wheel) is not released at the moment. If you don't know how to do compilation of Python packages, and are not satisfied with old version for Windows (see release 1.3 below) , please contact developers for help!

ARC can be now installed from pip
pip install ARC-Alkali-Rydberg-Calculator

- fixed bug that caused Numerov not to return result (bd269840f4a5a1b18df6466cd80d3bfe2d240f7e)
- global installation of the package now possible (only on Linux for now) (8e0c51026fdce35585574a1d48eacfc2960244c9)

Note: when using IPython notebook with examples, make sure to set Python kernel same as the Python version of the downloaded package (Python 2.7 or Python 3.5).

New version is **Python 3 and Python 2.7 compatible**. Examples are expanded and documentation corrected. Please download below pre-compiled version for your operating system and your Python version.

**Update 17-08-2017:** if Numerov integration gives 0 for dipole matrix element, please try using fixed version below, or refer to the latest release.

This is version 1.1rc of ARC.

**Recommended installation** is done by downloading below correct pre-compiled package for Windows, Mac or Linux 64-bit machines.

**Advanced** Linux and Mac users can also download the source, and compile C extension, following [Installation instructions](http://arc-alkali-rydberg-calculator.readthedocs.io/en/latest/installation.html#compiling-c-extension). For Windows users, we recommend using pre-compiled binary provided below. Please contact ARC developers if you have problems with that.

Several minor bug U/I fixes, updated Hydrogen class, updated and expanded precalculated databases. Now ships with C instead of C++ code for optimal Numerov calculation, reducing dependencies.