ln

The natural logarithm. Gives the magnitude of the number. On zero, returns -inf. Below zero, returns NaN, a special value that always causes failure when compared to other numbers. (ie. (NaN<0) ⇒ false, (Nan>=0) ⇒ false)

• ln(x) = log(x, e)
• ln(x)/ln(10) = log10(x)
• ln(2)=0.6931-ish
• ln(e)=.999999 (odd, hunh?)
• ln(10)=2.3026-ish

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-1 ln trace #NaN
0 ln trace #-inf
1 ln trace #0
e ln trace #1
e dup mul ln trace #2