Andy Black wrote:
> Well, I wouldn't mind doing that but I am a bit mathematically challenged :)
> Also, I need to be able to raise e to the x where x is a signed, floating
> point number. Not as easy as dealing with unsigned integer values.
recall e^(a+b) == e^a * e^b
call a the integer part and b the fractional part.
code has already been posted to do the integer part
The fractional part can be done with a lookup table, and a simple linear
interpolation, or maybe a polynomial regression would work,
all depending on how accurate you need to be.
Just for giggles, I opened up excel and did a quick curve (every .01 from 0 to 1) and
third order polynomial regression.
e^b (where b >= 0 and b <= 1) =~ 0.2787 b^3 + 0.4214 b^2 + 1.0181 b + 0.9991
Results here are probably good for about 3 significant figures
How accurate do you need to be?
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Adam Wozniak Chief Architect
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