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 Vertical log scale and negative values		  New Topic  Reply to Topic
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grzegorzzewski

1 Posts
Posted - 08/30/2013 :  6:32:27 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
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.
Edited by - grzegorzzewski on 08/31/2013 04:01:38 AM

Shirley_GZ

China
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Posted - 09/02/2013 :  03:25:26 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
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
Edited by - Shirley_GZ on 09/02/2013 03:26:18 AM
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