Regarding "interval mathematics", Wikipedia has an article,
http://en.wikipedia.org/wiki/Interval_(mathematics)
Oscar, are you looking to do interval arithmetic?
http://en.wikipedia.org/wiki/Interval_arithmetic
Via a quick Google, I found this toolbox
http://www.ti3.tu-harburg.de/rump/intlab/
And a Matlab 5 version
http://www.ti3.tu-harburg.de/zemke/b4m/
I took a quick look. My impression is that both should work in Octave.
Ben
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