<- [[.:prplreference| PRPL reference]] <- [[.:prplreference#math|Math]] ===== ln ===== ^Arguments^Result^Notation^ |float| float| [float- float] | === Description === 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)
other logarithms
ln(x) = log(x, e)
ln(x)/ln(10) = log10(x)
ln(2)=0.6931...
ln(e)=.999999
ln(10)=2.3026...
=== Examples === trace(ln(-1)) #prints 'NaN' trace(ln(0)) #prints '-inf' trace(ln(1)) #prints '0' trace(ln(e)) #prints '1'