# FCI implementation

Could you suggest, please, a manual/textbook/tutorial for implementing FCI (full configuration interaction) method on computers. I am interesting in algorithms mainly. I would like to write my own code, so I want to study how one can provide convenient indexing for configurations and what tricks are usually used to decrease computation time.

• Molpro is not nearly as expensive as truly commercial packages like Gaussian. As one can see on molpro.net/info/…, a single workstation license costs $350/$600 for the serial/parallel version. That's about the same price as Microsoft Office was the last time I looked (close to 10 years ago). – Jeff Oct 23 '13 at 14:52