We can add that, it's probably roughly equal to this:
GENERIC: e^-1 ( x -- y )
M: object e^-1 e^ 1 - ; inline
M: float e^-1
dup 0.7 < [
dup e^ dup 1.0 = [
drop
] [
[ 1.0 - * ] [ log / ] bi
] if
] [ e^ 1.0 - ] if ; inline
{ 1.00000000005e-10 } [ 1e-10 e^-1 ] unit-test
Or calling out to ``expm1(double)`` if it's available on your platform.
It might take a little bit to write some tests and make sure it handles
enough cases, but I can queue that up...
Regarding plotting, we have interfaces to Google Charts, and some basic X/Y
plotting line charts, and some users have used third party programs like
gnuplot or graphviz for other kinds of rendering.
Best,
John.
On Sun, Nov 3, 2019 at 10:55 PM Sanjay Jain via Factor-talk <
factor-talk@lists.sourceforge.net> wrote:
> I was going through the list of math functions. I found log1+ (ln(1+x))
> but did not find its counterpart e^x - 1 which is equally important for
> precision with small x. Kindly clarify and provide.
>
> Sanjay Jain
>
>
> _______________________________________________
> Factor-talk mailing list
> Factor-talk@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/factor-talk
>
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