I have a "simple" logarithmic function: - log(1-$a1)/log(1+$i$1) where
the $a colomn varies between 0 and 0.9999 and $i$1 is always positive.
A xy chart is drawn for this function with a logarithmic Y-axis.

Displaying the chart always provokes an arror message: (something like)
-Negative or null values cannot be correctly drawn in logarithmic
charts....-.

For as far as my algebaic knowledge goes, this function (within the
data range) never gets negative. Why the error message? And more
inmportantly, how to get rid of it?

Turning DisplayAlerts off is NOT an option, as the Workbook that
contains that function can display valid messages.


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