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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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KEYWORD
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LN.KEY
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1993-11-07
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431b
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10 lines
* ln internal+external
ln(x) is the natural logarithmic function of x. Its base is e. It is
the inverse to exp(x). Note that if it has multi-values, the ln(x)
only gives a principle value (P.V.) and other values are
P.V.+2*k*pi*i (where k=0, 1, 2,..., -1, -2, ...).
If x is complex number (x=A+B*i) then
ln(x)=ln(abs(x))+i*atan2(A,B).
See also: exp.
e.g. ln(e) gives 1.