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#1
Posted to microsoft.public.excel.charting
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Getting Rid of Error Message
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$1 is always positive. A xy chart is drawn for this function with a logarithmic Y-axis. Displaying the chart always provokes an arror message: (something like) -Negative or null values cannot be correctly drawn in logarithmic charts....-. For as far as my algebaic knowledge goes, this function (within the data range) never gets negative. Why the error message? And more inmportantly, how to get rid of it? Turning DisplayAlerts off is NOT an option, as the Workbook that contains that function can display valid messages. -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#2
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Getting Rid of Error Message
Are there any error bars which might lead to a negative number?
- Jon ------- Jon Peltier, Microsoft Excel MVP Peltier Technical Services Tutorials and Custom Solutions http://PeltierTech.com/ _______ "rvExcelNewTip" wrote in message news:rvExcelNewTip.21b9am_1136715001.478@excelforu m-nospam.com... I have a "simple" logarithmic function: - log(1-$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. -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#3
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Getting Rid of Error Message
The error shows even if the chart is drawn without any error bars. As soon as you switch the scale of the Y-axis to logarithmic, you get it. PS: I do have a problem with error bars in a logarithmic plot in a related problem: http://www.excelforum.com//showthrea...5&goto=newpost  -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#4
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Getting Rid of Error Message
Any blank cells in the source data range?
- Jon "rvExcelNewTip" wrote in message news:rvExcelNewTip.21cx8y_1136792701.0076@excelfor um-nospam.com... The error shows even if the chart is drawn without any error bars. As soon as you switch the scale of the Y-axis to logarithmic, you get it. PS: I do have a problem with error bars in a logarithmic plot in a related problem: http://www.excelforum.com//showthrea...5&goto=newpost -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#5
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Getting Rid of Error Message
No blank cells in the source data range! Excel version 2003 I should perhaps add that the offending error message suggests the following advise:  - Enter only values that are positive in the cells used by the chart - Unselect the logarithmic scale I also changed the formula to -ABS(LOG(1-$A1)/LOG(1+$I$1))-, thereby eliminating the leading minus sign. Same result. Apparently, Excel is suspicious of the -ABS(LOG(1-$A1))- part of the formula. If you substitute this test formula for the original one, the message persists. The -1-$A1- part could theoretically result in a negative argument for the -LOG- function, but the actual data don't as the values in the -$A- column are between 0 and 0.999 In my opinion the resulting message is misplaced, not to say an error (or should I say bug in this case?) Thanks Jon for your continuing support. -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#6
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Getting Rid of Error Message
-ABS(LOG(1-$A1)/LOG(1+$I$1))-
I'm confused by your apparent use of hyphen/minus sign for quotes. Do you mean this? "ABS(LOG(1-$A1)/LOG(1+$I$1))" Since $A1 is always less than 1, 1-$A1 is always positive, but log(1-$A1) is either zero (if $A1 is 0) or negative (if $A10 and <0.999). If you're plotting this function on a log scale, Excel will reject it. If you're plotting ABS(this function) on the log scale, and there's an instance where $A1=0, then ABS(the function)=0 and Excel will again reject it. - Jon ------- Jon Peltier, Microsoft Excel MVP Peltier Technical Services Tutorials and Custom Solutions http://PeltierTech.com/ _______ "rvExcelNewTip" wrote in message news:rvExcelNewTip.21gony_1136968201.6344@excelfor um-nospam.com... No blank cells in the source data range! Excel version 2003 I should perhaps add that the offending error message suggests the following advise: - Enter only values that are positive in the cells used by the chart - Unselect the logarithmic scale I also changed the formula to -ABS(LOG(1-$A1)/LOG(1+$I$1))-, thereby eliminating the leading minus sign. Same result. Apparently, Excel is suspicious of the -ABS(LOG(1-$A1))- part of the formula. If you substitute this test formula for the original one, the message persists. The -1-$A1- part could theoretically result in a negative argument for the -LOG- function, but the actual data don't as the values in the -$A- column are between 0 and 0.999 In my opinion the resulting message is misplaced, not to say an error (or should I say bug in this case?) Thanks Jon for your continuing support. -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#7
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Getting Rid of Error Message
Jon Peltier Wrote: -ABS(LOG(1-$A1)/LOG(1+$I$1))- I'm confused by your apparent use of hyphen/minus sign for quotes. Do you mean this? "ABS(LOG(1-$A1)/LOG(1+$I$1))" Jon, It's my turn to be confused In my view of the forum messagethe hyphens don't show up. I used (and hopefully this comes through unscattered) either --LOG(1-$A$1)/LOG(1+$I$1)- or -ABS(LOG(1-$A$1)/LOG(1+$I$1))- Jon Peltier Wrote: Since $A1 is always less than 1, 1-$A1 is always positive, but log(1-$A1) is either zero (if $A1 is 0) or negative (if $A10 and <0.999). If you're plotting this function on a log scale, Excel will reject it. If you're plotting ABS(this function) on the log scale, and there's an instance where $A1=0, then ABS(the function)=0 and Excel will again reject it. You hit the nail on the head: I should start the $A range at a value other than zero (e.g. 0.001) and then the message disappears. Excel, after all, was right! Many Thanks -- rvExcelNewTip ------------------------------------------------------------------------ rvExcelNewTip's Profile: http://www.excelforum.com/member.php...o&userid=15668 View this thread: http://www.excelforum.com/showthread...hreadid=499144 |
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#8
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Getting Rid of Error Message
You should be using plain text in these forums, if you're not already. The
two bits you included in your first para we --LOG(1-$A$1)/LOG(1+$I$1)- [two leading hyphens and one trailing] -ABS(LOG(1-$A$1)/LOG(1+$I$1))- [single leading and trailing hyphens] - Jon ------- Jon Peltier, Microsoft Excel MVP Peltier Technical Services Tutorials and Custom Solutions http://PeltierTech.com/ _______ "rvExcelNewTip" wrote in message news:rvExcelNewTip.21ik9a_1137055801.4814@excelfor um-nospam.com... Jon Peltier Wrote: -ABS(LOG(1-$A1)/LOG(1+$I$1))- I'm confused by your apparent use of hyphen/minus sign for quotes. Do you mean this? "ABS(LOG(1-$A1)/LOG(1+$I$1))" Jon, It's my turn to be confused In my view of the forum messagethe hyphens don't show up. I used (and hopefully this comes through unscattered) either --LOG(1-$A$1)/LOG(1+$I$1)- or -ABS(LOG(1-$A$1)/LOG(1+$I$1))- Jon Peltier Wrote: Since $A1 is always less than 1, 1-$A1 is always positive, but log(1-$A1) is either zero (if $A1 is 0) or negative (if $A10 and <0.999). If you're plotting this function on a log scale, Excel will reject it. If you're plotting ABS(this function) on the log scale, and there's an instance where $A1=0, then ABS(the function)=0 and Excel will again reject it. You hit the nail on the head: I should start the $A range at a value other than zero (e.g. 0.001) and then the message disappears. Excel, after all, was right! Many Thanks -- rvExcelNewTip |
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