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. Eg. (NaN<0) -> false, (Nan>=0) -> false

other logarithms \  ln(x) = log(x, e) \
ln(x)/ln(10) = log10(x) \
ln(2)=0.6931… \
ln(e)=.999999 \
ln(10)=2.3026… \

trace(ln(-1)) #prints 'NaN'
trace(ln(0))  #prints '-inf'
trace(ln(1))  #prints '0'
trace(ln(e))  #prints '1'

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