| T O P I C R E V I E W |
| grzegorzzewski |
Posted - 08/30/2013 : 6:32:27 PM
Origin 8.6.
Haw can I display data from chart in log scale for Y-axis if the values are negative? Values are big and i want to use log scale (symmetrical log) to display but there is a problem with negative value on chart. |
| 1 L A T E S T R E P L I E S (Newest First) |
| Shirley_GZ |
Posted - 09/02/2013 : 03:25:26 AM
Hi,
You can add a new column, use the below formula to set values:
sign(x) * log(1 + abs(x)),
Then use this column to plot the graph. Please note: when you use the data reader to read the data info, the result are not real log value. (ORG-7470)
In the upcoming Origin 9.1, it supports to use the direct and inverse formula to specify the axis scale. This would be a better solution. See details here, https://originlab.jira.com/wiki/display/main/User+Defined+Axis+Scale+Type
Shirley
Originlab Technical Service Team |
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