2 ln - logarithm function
8 x nonzero real or complex
9 eps nonzero real, defaults to epsilon()
11 return real or complex
14 Approximate the natural logarithm function of x by a multiple of
15 epsilon, the error having absolute value less than 0.75 * eps.
16 If n is a positive integer, ln(x, 10^-n) will usually be correct
17 to the n-th decimal place.
20 > print ln(10, 1e-5), ln(10, 1e-10), ln(10, 1e-15), ln(10, 1e-20)
21 2.30259 2.302585093 2.302585092994046 2.30258509299404568402
23 > print ln(2+3i, 1e-5), ln(2+3i, 1e-10)
24 1.28247+.98279i 1.2824746787+.9827937232i
31 NUMBER *qln(NUMBER *x, NUMBER *eps)
32 COMPLEX *cln(COMPLEX *x, NUMBER *eps)
35 exp, acosh, asinh, atanh