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[Jan Stránský <question692166@xxxxxxxxxxxxxxxxxxxxx>]

Question #692166 on Yade changed:
https://answers.launchpad.net/yade/+question/692166

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> Do I misunderstand something?

yes, the signs :-)
###
from math import log,exp
L = 0.14
l = 0.12
eEng = (l-L)/L
eLog = log(1+eEng)
eEng2 = exp(eLog) - 1
eEng2wrong = exp(-eLog) - 1
print("eEng",eEng)                               # -0.143
print("eLog",eLog)                               # -0.154
print("eEng2",eEng2)                          # -0.143
print("eEng2wrong",eEng2wrong) # +0.166
###

cheers
Jan

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