On Dec 19, 2011, at 6:54 PM, Jussi Lehtola wrote:

> To do this I'd need to know which entries are used in the checkpoint
> files, i.e., what I have to write out.

For all intents and purposes, all this code is in the OpenQube side-project:
https://github.com/cryos/openqube/blob/master/src/gaussianfchk.cpp

Granted, we will soon also support reading orbital eigenvalues/energies and 
symmetry labels, which are nice. Gaussian finally has a complete description of 
the format:
http://www.gaussian.com/g_tech/g_ur/f_formchk.htm

> Furthermore I'd like to know where the evaluation of the orbitals and
> densities is performed; I might contribute the code necessary to go
> beyond d-functions in Avogadro.

https://github.com/cryos/openqube/blob/master/src/gaussianset.cpp

Before you add code for other functions, please let me know and I'll get you in 
touch with someone who's planning on restructuring the code for improved speed 
and also the higher-order functions.

-Geoff
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