Issue 86661 - Logarithmic regression equations are displaying log(x) instead of ln(x)
Summary: Logarithmic regression equations are displaying log(x) instead of ln(x)
Status: CLOSED FIXED
Alias: None
Product: General
Classification: Code
Component: chart (show other issues)
Version: 3.3.0 or older (OOo)
Hardware: All All
: P3 Trivial (vote)
Target Milestone: ---
Assignee: kla
QA Contact: issues@graphics
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2008-03-03 22:32 UTC by belegdol
Modified: 2013-02-24 21:21 UTC (History)
2 users (show)

See Also:
Issue Type: DEFECT
Latest Confirmation in: ---
Developer Difficulty: ---

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this issue.
Description belegdol 2008-03-03 22:32:12 UTC 
Unless I am mistaken, the equation of logarithmic regression should be:
f(x)=a*ln(x)+b
Unfortunately, the brand new "display equation on chart" function results in the
following:
f(x)=a*log(x)+b
Which is definitely not the same.
Comment 1 bjoern.milcke 2008-03-10 10:19:41 UTC 
Well, "definitely not the same" is not correct. ln states that the base is "e".
log says nothing about the base. By convention many people interpret it to be
10, but that's not necessarily so. It could also be 2 or e as well.

But you are right that it may be unclear. So it should read "ln" instead of "log".
Comment 2 kla 2008-03-10 11:59:49 UTC 
@IHA: one for you.
kla
Comment 3 IngridvdM 2008-03-12 11:35:03 UTC 
Fixed in CWS chart23.
Comment 4 IngridvdM 2008-03-13 15:19:45 UTC 
->Thomas, please verify in CWS chart23.
Comment 5 kla 2008-04-02 08:51:46 UTC 
Now the equation of logarithmic regression are:
f(x)=a*ln(x)+b in CWS chart 23 -> verified
Comment 6 p9w.vu.31122010 2008-05-07 18:14:27 UTC 
Verified fixed in BEA300_m2. Closing.