INTLAB is no longer available for free, although its cost is still
very reasonable. This is no big deal for me as I have access to it
and used it in a project that is now finished, namely the writing of
a chapter devoted to assessing the accuracy of floatting point
computations in a book that has now appeared. I hope many people
will get used to the idea of changing rounding mode to see how
sensitve their computations are.
Le 17/09/2015 19:05, John Swensen a
On 17.09.2015 18:31, Eric Walter wrote:
Yes, this might be the way. In MATLAB I got around my
by using Sigfried Rump's interval toolbox INTLAB. Many
thanks for your
suggestion, and thanks to the Octave community for their
you are welcome. Since you know INTLAB, please check whether
the free Octave interval package is a valid replacement for
your project. If you are missing some functionality in the
interval package, please let me know.
You can find many functions with directed rounding here (no
need to change the rounding mode yourself):
P.S. The Octave interval package is conforming to the IEEE
standard for interval arithmetic. It might behave
differently compared to INTLAB, especially on empty
While most certainly not an Open Source compatible
license, INTLAB is open source (small o and s) and free to use
excluding only if you are selling a product that uses it. It is
free to use, even in commercial setting as long as you aren’t
trying to sell a product that includes the code.
As of Octave 3.8, it sounds like INTLAB is fully
compatible with Octave.