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[Octave-bug-tracker] [bug #44310] log and functions which use log return


From: Michael Godfrey
Subject: [Octave-bug-tracker] [bug #44310] log and functions which use log return incorrect result
Date: Sun, 08 Mar 2015 21:41:04 +0000
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0

Follow-up Comment #15, bug #44310 (project octave):

Mike:  I thought about this a bit more: How much work
is it for a C++ person to fix this by use of replacing

return log ((1.0 + x) / (1.0 - x)) / 2.0;
with
return catanh( x ); 

If it is not too much work to get all the declarations
straight, it would be good to get this into 4.0.

It is the following:
1. Regression
2. Incorrect result
3. Incompatible with Matlab

these formally qualify it as a blocker.
I f I could help more I would. If you tell me
what to do, I will test it.


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