The interval package for real-valued interval arithmetic provides data types and operations for verified computing. It can be used to handle uncertainties, estimate arithmetic errors and produce reliable results. Also it can help find guaranteed solutions to numerical problems. Thanks to GNU MPFR many arithmetic operations are provided with best possible accuracy. The implementation of intervals in inf-sup format is based on interval boundaries represented by binary64 numbers and is standard conforming to IEEE 1788.

WWW: https://gnu-octave.github.io/packages/interval/
