Estimate logarithm quickly
04-26-2022, 05:52 PM
Post: #16
 klesl Member Posts: 98 Joined: Mar 2016
RE: Estimate logarithm quickly
Sorry to hijack this topic, I found this estimation in czech written book (published in 1984)
log (x) = (z^2*a+b)*z
z = (x-1)/(x+1)
and limits for x are:
for decadic logarithm the x must be between 0,316 and 3,162
for natural logharithm the x must be between 0,6065 and 1,649

the constants a and b:
for log(x): a = 0,36415, b = 0,86304
for ln(x): a= 0,70225, b = 1,99938

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