Wrong results with exp(-8+)

[schungx]

When exp with 0.0002 tolerance goes around -8 to -8.5, the result starts flipping into negative.

Which is, of course, incorrect, as there is no index for exp that turns out negative.

[paupino]

One option here, since it is unlikely to converge, is to return the previous positive result which would be closer? What do you think?

[schungx]

Or clamp it down to zero once it flips... or raise an underflow error...