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Bug 424684 - Incorrect Exponential Trendline Equation
Incorrect Exponential Trendline Equation
Status: RESOLVED DUPLICATE of bug 408520
Product: Gnumeric
Classification: Applications
Component: Charting
1.7.x
Other All
: Normal normal
: ---
Assigned To: Jean Bréfort
Jody Goldberg
Depends on:
Blocks:
 
 
Reported: 2007-03-30 23:09 UTC by Cole Petersburg
Modified: 2007-03-31 06:24 UTC
See Also:
GNOME target: ---
GNOME version: ---



Description Cole Petersburg 2007-03-30 23:09:56 UTC
Please describe the problem:
Gnumeric does not compute correct exponential trendline equations.

Steps to reproduce:
1. Create a graph: {x|1,2,3},{y|e^1,e^2,e^3}
2. Plot
3. Create Trend Line
4. Create exponential trend line


Actual results:
Trendline appears on the graph, fits the points, but the equation is given as:
ln(y)=2.71828x+1


Expected results:
ln(y)=x

Does this happen every time?
Same result for {x|2,4,6}; at least it's consistent.

Other information:
I plan to file a somewhat different bug involving decaying exponentials.
Comment 1 Cole Petersburg 2007-03-30 23:11:49 UTC
Woops, step 4 should be "create exponential equation" from the trendline.
Comment 2 Jean Bréfort 2007-03-31 06:24:06 UTC
I get ln(y)=1x+0
This bus has already been fixed in HEAD.
If you really want to use a development version, you should manage to always use the latest available one.

*** This bug has been marked as a duplicate of 408520 ***