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Complex Number Addition When Evaluating Natural Log
 Rank: Newbie
Groups: Registered
Joined: 23/11/2013(UTC) Posts: 5 
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Hi,
I have noticed an issue when evaluating a natural log as a function, I am getting seemingly random additions of a multiple of i.
If I evaluate the expression, it for some reason adds a multiple of i to the correct, real portion of that.
For example suppose I have the function f(a)=ln((a-1)/(a+1)). If I evaluate this at a=1.3921, I should get the answer f(1.3921)=-1.8084. But the function returns f(1.3921) = -1.8085+3.1416*i. It appears to be adding 3.1416*i (pi*i). I have to get around this by using Re(). Am I missing something or is this an error?
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  Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654   Location: Italy Was thanked: 1340 time(s) in 879 post(s)
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I can't replicate the issue. Maybe you have something different in SMath settings (Tools > Settings... > Calculation > Answer). Edited by user 30 July 2015 10:48:04(UTC)
| Reason: Not specified Davide Carpi attached the following image(s): |
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Rank: Newbie
Groups: Registered
Joined: 23/11/2013(UTC) Posts: 5
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Thank you for your reply. I have tried to replicate it again myself but I have been unable to as well. I will find the worksheet it originally happened in and will try to post the issue.
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Complex Number Addition When Evaluating Natural Log
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