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Subhayan_S
USA
3 Posts |
 Posted - 08/24/2023 : 4:43:04 PM
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Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2022 (64-bit) SR1 9.9.0.225 (Academic)
Operating System: Windows 11
Greetings,
I am trying to plot 2 graphs in a log-log plot with one y axis oriented to the top (~0 at bottom and bigger numbers towards top) and the other y axis oriented to the bottom (~0 at top and bigger numbers towards the top) while the 2 y axes meet at ~zero. But I am not able to make the 2 axes meet at 0 i.e., they are not intersecting the x-axis (lower one) at the same value. Any suggestions?
More background: I have conductivity (x-axis) vs seebeck coeff (y-axis) data that needs to be plotted in a log-log plot. Some of the seebeck data points are negative so I separated the positive and negative data pairs and took the absolute value of the negative data points and plotted both data sets in a double y graph (see the excel file attached). But is there a way to make the 2 y axes intersect the x-axis (bottom one) at the same value?
https://my.originlab.com/ftp/forum_and_kbase/Images/example_ss.xlsx
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YimingChen
1592 Posts |
Posted - 08/25/2023 : 08:35:24 AM
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The logarithm of 0 is undefined, so it's not possible to represent 0 on a log scale.
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Subhayan_S
USA
3 Posts |
Posted - 08/25/2023 : 09:21:34 AM
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quote:
Originally posted by YimingChen
The logarithm of 0 is undefined, so it's not possible to represent 0 on a log scale.
Yes of course, that is why I said ~0 (near to zero). Realistically it can be, say, 0.01
So is it possible to make the 2 y axes intersect the x axis (bottom one) at 0.01?
It does not necessarily have to be a continuous double y graph even. Is there other ways to plot it? |
Edited by - Subhayan_S on 08/25/2023 09:45:52 AM |
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Subhayan_S
USA
3 Posts |
Posted - 08/25/2023 : 10:53:31 AM
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quote:
Originally posted by Subhayan_S
quote:
Originally posted by YimingChen
The logarithm of 0 is undefined, so it's not possible to represent 0 on a log scale.
Yes of course, that is why I said ~0 (near to zero). Realistically it can be, say, 0.01
So is it possible to make the 2 y axes intersect the x axis (bottom one) at 0.01?
It does not necessarily have to be a continuous double y graph even. Is there other ways to plot it?
Update: Solved it. If anybody else is having this issue, the trick is not to use the double y plot but simply use 'symmetrical log scale' option in standard x-y plot. It will plot your negative values in log scale |
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Double y plotting and x-y axes intersection