This file contains two simple extensions of numerical integrations written in C. The first is a n-dimensional quadrature integration, which extends the GSL integration routine "gsl_integration_qags". The following is a simple Monte Carlo integration. The two have matching signatures to allow for dynamically exchanging the two according the number of dimensions being used and the precision required.
Additionally the fixed_point file has a very simple fixed point finder, that uses the Aitken's delta method for acceleration. It is a copy of the one found in the SciPy modules.
Note: this isn't novel in any sense. I basically rewrote routines I normally use in Python, and couldn't find in C. Given that I use these very often, maybe other's might benefit from them too.