mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
36 lines
817 B
Plaintext
36 lines
817 B
Plaintext
NAME
|
|
ln - logarithm function
|
|
|
|
SYNOPSIS
|
|
ln(x [,eps])
|
|
|
|
TYPES
|
|
x nonzero real or complex
|
|
eps nonzero real, defaults to epsilon()
|
|
|
|
return real or complex
|
|
|
|
DESCRIPTION
|
|
Approximate the natural logarithm function of x by a multiple of
|
|
epsilon, the error having absolute value less than 0.75 * eps.
|
|
If n is a positive integer, ln(x, 10^-n) will usually be correct
|
|
to the n-th decimal place.
|
|
|
|
EXAMPLE
|
|
> print ln(10, 1e-5), ln(10, 1e-10), ln(10, 1e-15), ln(10, 1e-20)
|
|
2.30259 2.302585093 2.302585092994046 2.30258509299404568402
|
|
|
|
> print ln(2+3i, 1e-5), ln(2+3i, 1e-10)
|
|
1.28247+.98279i 1.2824746787+.9827937232i
|
|
|
|
LIMITS
|
|
x != 0
|
|
eps > 0
|
|
|
|
LIBRARY
|
|
NUMBER *qln(NUMBER *x, NUMBER *eps)
|
|
COMPLEX *cln(COMPLEX *x, NUMBER *eps)
|
|
|
|
SEE ALSO
|
|
exp, acosh, asinh, atanh
|