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http://www.openoffice.org/issues/show_bug.cgi?id=112773
User regina changed the following:
What |Old value |New value
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CC|'jbfaure' |'jbfaure,regina'
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Ever confirmed| |1
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Status|UNCONFIRMED |NEW
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------- Additional comments from [email protected] Sat Sep 18 11:07:01
+0000 2010 -------
An "exponentiell trend" means that you want to use a model y = a * b^x. Using
your data the basis b would be exp(-2440). That is so near to zero, that it
underflows to zero using double precision.
The trend line calculation should not use a and b to calculate the y-values, but
use ln(a) and ln(b) and first calculate ln(y), same as it is done in
ScInterpreter::CalculateTrendGrowth().
As workaround you can calculate intermediate value pairs using GROWTH and add
them as additional data series to your chart.
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