Re: Directed rounding

[Oliver Heimlich]

On 17.09.2015 18:31, Eric Walter wrote:
> Dear Oliver,
>
> Yes, this might be the way. In MATLAB I got around my rounding problem
> by using Sigfried Rump's interval toolbox INTLAB. Many thanks for your
> suggestion, and thanks to the Octave community for their amazing
> reactivity.
>
> Best regards,
>
> Eric

Eric,

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):
http://octave.sourceforge.net/interval/function/mpfr_function_d.html

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 intervals.

Best regards
Oliver