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#1
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Major and minor gridlines on logarithmic axis excel 2007
In excel 2007 all service packs.
Create a scatter plot with data greater than 1E13. Select logarithmic axis with any base (such as 10) Choose major and minor gridlines. When the data is large ( 1e13) only major gridlines show up. Minor gridlines only does work, but not major *and* minor. Are their any solutions? It's almost impossible to read a log plot without minor gridlines, and it's important to highly the major lines as well with a dark line. Log plots are essential in any engineering or scientific plotting. Excel is slowly and painfully becoming quite standard for this type of plotting. |
#2
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Major and minor gridlines on logarithmic axis excel 2007
Please give as about six data points to try
best wishes -- Bernard V Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme remove caps from email "Vincent" wrote in message ... In excel 2007 all service packs. Create a scatter plot with data greater than 1E13. Select logarithmic axis with any base (such as 10) Choose major and minor gridlines. When the data is large ( 1e13) only major gridlines show up. Minor gridlines only does work, but not major *and* minor. Are their any solutions? It's almost impossible to read a log plot without minor gridlines, and it's important to highly the major lines as well with a dark line. Log plots are essential in any engineering or scientific plotting. Excel is slowly and painfully becoming quite standard for this type of plotting. |
#3
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Major and minor gridlines on logarithmic axis excel 2007
use this data in two columns:
5 1.00E+13 12 2.00E+13 13 3.00E+13 Insert scatter plot. Axis - vertical axis with log scale Gridlines - horizontal - major and minor Try minor only and you see what it should look like. Then change your y-axis data to 1E12, 2e12, and 3e12. the major and minor suddenly show up. for a log plot I typically make a dark black line for the 10's and light gray for the 1's. It makes the log plot much more readable. This has been broken for at least SP1 and SP2. It worked fine in 2003 and before. How do I make a bug report on this? I see no issues in the knowledge base or usenet. |
#4
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Major and minor gridlines on logarithmic axis excel 2007
Hi Vincent:
I can confirm your observation: with the data shown in your last message Excel 2007 will not display minor gridlines while Excel 2003 can. I do not think the data is very representative of most peoples work but I will report the 'bug' to MS Why not plot LOG(y) using =LOG(B2) etc x y log(y) 5 1.00E+13 13 12 2.00E+13 13.30103 13 3.00E+13 13.47712125 Plot first and third column and now you can have minor gridlines You could even plot all three columns; put log(y) on a secondary axis and hide most of its effects other than the gridlines. Email me privately (get my email from my website) and I can send you a sample file best wishes -- Bernard V Liengme Microsoft Excel MVP http://people.stfx.ca/bliengme remove caps from email "Vincent" wrote in message ... use this data in two columns: 5 1.00E+13 12 2.00E+13 13 3.00E+13 Insert scatter plot. Axis - vertical axis with log scale Gridlines - horizontal - major and minor Try minor only and you see what it should look like. Then change your y-axis data to 1E12, 2e12, and 3e12. the major and minor suddenly show up. for a log plot I typically make a dark black line for the 10's and light gray for the 1's. It makes the log plot much more readable. This has been broken for at least SP1 and SP2. It worked fine in 2003 and before. How do I make a bug report on this? I see no issues in the knowledge base or usenet. |
#5
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Major and minor gridlines on logarithmic axis excel 2007
Hi.
You can mimic minor gridlines indirectly by adding a second series to your logarithmic plot. Create two columns to contain the gridline information as shown below (Here I am showing columns C and D and they start at Row 2. Row C D 1 2 10 2e13 3 15 3e13 4 15 4e13 5 15 5e13 6 15 6e13 7 15 7e13 8 15 8e13 9 15 9e13 These are the gridline-information for the decade between 1e13 and 1e14. If you want to show more decades, you could simply use the formula =D2*10 at D10 and fill down to as many decades as you want. In Column C, I arbitrarily entered 10 in Row 2 (in scale on the x-axis) and 15 in the rest (slightly larger than the x-axis maximum in your logarithmic plot). Now add the series Column D (y-values) vs Column C (x-values) to your logarithmic plot. Only the first data-point (10, 2e13) will show up (the rest of the points are off scale); this is needed for doing the next step. Include horizontal error bars to this series and format them as: Display: Minus End Style: No Cap Error Amount: Percentage, 100.0% Now change C2 to 15 so that that marker will also go off scale. The error bars will mimic minor gridlines. Format their color, line thickness, and line style as you wish to distinguish them from the major gridlines. With regards, B. R. Ramachandran "Vincent" wrote: use this data in two columns: 5 1.00E+13 12 2.00E+13 13 3.00E+13 Insert scatter plot. Axis - vertical axis with log scale Gridlines - horizontal - major and minor Try minor only and you see what it should look like. Then change your y-axis data to 1E12, 2e12, and 3e12. the major and minor suddenly show up. for a log plot I typically make a dark black line for the 10's and light gray for the 1's. It makes the log plot much more readable. This has been broken for at least SP1 and SP2. It worked fine in 2003 and before. How do I make a bug report on this? I see no issues in the knowledge base or usenet. |
#6
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Major and minor gridlines on logarithmic axis excel 2007
Bernard,
I appreciate your response and looking into this matter. I hope they will eventually be able to create a hotfix for this bug. I've seen a lot of confusion on usenet about the use of a log scale. A typical reason you want to plot with a log scale is - 1) Increase the dynamic range of the plot, and 2) look for exponential trends in you data (shows up as linear). It's not because you want to actually take the log of the data. Having a log scale allows you to quickly read off the scale (mainly using the minor gridlines). Taking the log of the data makes that very difficult. This brings me to another annoyance with log plots on excel. Do not continuously display pop-up errors when you plot zeros on a log plot. There is nothing wrong with plotting this - just give me a graceful error only once and plot blanks. Engineering data has zeros all the time, that should not preclude visualizing it on a log scale! |
#7
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Major and minor gridlines on logarithmic axis excel 2007
I have a somewhat related issue with Log axes graphs...
If I add error bars to data and display them with a linear y-axis, all is well. If I convert the y-axis to log, some of the bars (not all) are not finished correctly and Excel draws triangles to the next error bar. Is there a work around for this? Thanks. Steve |
#8
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Major and minor gridlines on logarithmic axis excel 2007
Lets say you have 100+/-120
in non logaritmic scale, you should have an error bar starting at -20 if you put that as a log, then you have an error because you cannot calculate the log of a negative or null value. And thus excel is lost. No solution than to change the data ! Misange migrateuse http://www.excelabo.net smmudge a écrit : I have a somewhat related issue with Log axes graphs... If I add error bars to data and display them with a linear y-axis, all is well. If I convert the y-axis to log, some of the bars (not all) are not finished correctly and Excel draws triangles to the next error bar. Is there a work around for this? Thanks. Steve |
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