[Scilab-users] lack of simplification for rational

[philippe]

Le 23/11/2016 à 21:20, Serge Steer a écrit :
 > First of all if you compute the rational fraction numerator or
 > denominator from their roots (and if they are complex conjugate) the
 > result is a complex polynomial even if the imaginary part is not shown.
 >


Yes I know these problems, but I was surprised that the simplification 
failed just because of a rounding error. In the last months I've got 
several times problems with rounding errors generating complex values.


 >
 > The simplication algorithm present in Scilab tryes to find reasonable
 > simplification based on the bezout equation error. But it has only be
 > written for the real case.

so that's the root of the problem!

Thanks,

Philippe