changing the axis to natural log scale

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Tue, 10/12/2010 - 11:44 am

Hi Guys

I have a problem with the graphic here, when i select to display the graph in natural log scale through the modify axis menu, the axis becomes something that doesn't make sense.

The graphs are attached here! q2.jpg q3.JPG
The range of your vertical axis includes zero; the log of zero is undefined. Perhaps you set the axis range to Manual, or perhaps you set the range to Autoscale From Zero.

If you set the axis range to Auto, or manually set the minimum range to something positive, it should work fine.

Added a bit later: I tried setting a log axis on a graph with Autoscale from Zero in 6.20 and 6.00 and it worked fine. Apparently, Igor is doing the Right Thing- ignoring the Autoscale from Zero setting when switching to Log mode. In response to your query to support@wavemetrics.com, I have asked you what version of Igor you are using.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

October 12, 2010 at 12:59 pm - Permalink

johnweeks wrote:
The range of your vertical axis includes zero; the log of zero is undefined. Perhaps you set the axis range to Manual, or perhaps you set the range to Autoscale From Zero.

If you set the axis range to Auto, or manually set the minimum range to something positive, it should work fine.

Added a bit later: I tried setting a log axis on a graph with Autoscale from Zero in 6.20 and 6.00 and it worked fine. Apparently, Igor is doing the Right Thing- ignoring the Autoscale from Zero setting when switching to Log mode. In response to your query to support@wavemetrics.com, I have asked you what version of Igor you are using.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com


Thanks John, I will check that, my Igor version is 6.12A.

October 12, 2010 at 03:38 pm - Permalink