The octave-forge package is the result of The GNU Octave Repositry project,
which is intended to be a central location for custom scripts, functions and
extensions for GNU Octave. contains the source for all the functions plus
build and install scripts.

This is fenv.

On supported architectures, change the rounding mode of the floating point
arithmetics (to nearest, up, down, to zero) or change the precision of the
arithmetical operations (single, double, double extended). Experimentally
test the properties of the floating point arithmetics.