diff options
Diffstat (limited to 'BUGS')
| -rw-r--r-- | BUGS | 15 |
1 files changed, 10 insertions, 5 deletions
@@ -1,5 +1,10 @@ -- No checks are made for intermediate overflows, which may occur - in the middle of the algorithms although the final result - may be representable. - More precisely for cos(x+i*y) = cos(x)*cosh(y) - sin(x)*sinh(y)*I, - if an overflow occurs in cosh(y), we assume cos(x)*cosh(y) overflows too. +- No checks are made for intermediate over- or underflows, which may occur + in the middle of the algorithms although the final result may be + representable. + For instance, if in the computation of Im (cos(x+i*y)) = -sin(x)*sinh(y) + an overflow occurs in sinh(y), the value sign(Im (cos(x+i*y))) * inf + is returned, even if sin(x) is sufficiently close to 0 such that + sin(x)*sinh(y) is representable. If furthermore an underflow occurred + in sin(x) (which has not been observed in practice), then the return + value would be NaN*(+-inf)=NaN. + |