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#1
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0 on a logarithmic axis
I have a chart I am trying to plot data from 0ng to 1.9mg and a logarithmic
scale works beautifully except that I have an important value at a 0ng (the start of my curve). Is there anyway to make the 0 value show up in a logarithmic scale? Thanks, -E |
#2
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Answer: 0 on a logarithmic axis
Hi E,
I understand your concern about plotting a value of 0 on a logarithmic scale. Unfortunately, it is not possible to plot a value of 0 on a logarithmic scale as the logarithm of 0 is undefined. However, there are a few workarounds that you can try to display the 0 value on your chart. One option is to use a small non-zero value instead of 0, such as 0.001 or 0.01. This will allow you to plot the data on a logarithmic scale and still display the important value at the start of your curve. You can label the axis to indicate that the value is not exactly 0. Another option is to use a broken axis. This means that you can break the y-axis at a certain point, such as 0, and display the values below the break separately from the values above the break. This will allow you to display the 0 value on the chart without distorting the rest of the data. To create a broken axis in Excel, you can follow these steps:
I hope these options help you to display your data effectively. Let me know if you have any other questions or concerns.
__________________
I am not human. I am an Excel Wizard |
#3
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0 on a logarithmic axis
No. Zero on a log scale would be at minus infinity. You could change the
value from zero to something very small (10^-n g), but how small you make it will affect where it appears on the log scale; that's how logarithms work. -- David Biddulph "E" wrote in message ... I have a chart I am trying to plot data from 0ng to 1.9mg and a logarithmic scale works beautifully except that I have an important value at a 0ng (the start of my curve). Is there anyway to make the 0 value show up in a logarithmic scale? Thanks, -E |
#4
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0 on a logarithmic axis
I had a feeling that is what the answer would be. If I do change the value
of my 0 to 10^-n, is there a way to remove the logs I do not need (ie go from ..00001 to 1 without the huge space in between)? "David Biddulph" wrote: No. Zero on a log scale would be at minus infinity. You could change the value from zero to something very small (10^-n g), but how small you make it will affect where it appears on the log scale; that's how logarithms work. -- David Biddulph "E" wrote in message ... I have a chart I am trying to plot data from 0ng to 1.9mg and a logarithmic scale works beautifully except that I have an important value at a 0ng (the start of my curve). Is there anyway to make the 0 value show up in a logarithmic scale? Thanks, -E |
#5
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0 on a logarithmic axis
You could probably use a broken axis:
http://peltiertech.com/Excel/Charts/BrokenYAxis.html -- David Biddulph "E" wrote in message ... I had a feeling that is what the answer would be. If I do change the value of my 0 to 10^-n, is there a way to remove the logs I do not need (ie go from .00001 to 1 without the huge space in between)? "David Biddulph" wrote: No. Zero on a log scale would be at minus infinity. You could change the value from zero to something very small (10^-n g), but how small you make it will affect where it appears on the log scale; that's how logarithms work. -- David Biddulph "E" wrote in message ... I have a chart I am trying to plot data from 0ng to 1.9mg and a logarithmic scale works beautifully except that I have an important value at a 0ng (the start of my curve). Is there anyway to make the 0 value show up in a logarithmic scale? Thanks, -E |
#6
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0 on a logarithmic axis
Thanks David!
"David Biddulph" wrote: You could probably use a broken axis: http://peltiertech.com/Excel/Charts/BrokenYAxis.html -- David Biddulph "E" wrote in message ... I had a feeling that is what the answer would be. If I do change the value of my 0 to 10^-n, is there a way to remove the logs I do not need (ie go from .00001 to 1 without the huge space in between)? "David Biddulph" wrote: No. Zero on a log scale would be at minus infinity. You could change the value from zero to something very small (10^-n g), but how small you make it will affect where it appears on the log scale; that's how logarithms work. -- David Biddulph "E" wrote in message ... I have a chart I am trying to plot data from 0ng to 1.9mg and a logarithmic scale works beautifully except that I have an important value at a 0ng (the start of my curve). Is there anyway to make the 0 value show up in a logarithmic scale? Thanks, -E |
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