On 12/22/08, Dieter Kaiser <drdieterkaiser at web.de> wrote:
> Thus, I do not think that we have errors in Maxima, but Sage get unexpected
> results for the erf function with complex arguments.
>
> Remark: We have small realparts in the results. This is due to the limited
> numerical accuracy of the routine.
It seems reasonable that if the result is known to be be real for all
arguments in some set of arguments, that a computed numerical
approximation should likewise be real. Can't the numerical function
just return realpart(whatever) when the argument is known to yield
a real result?
best
Robert