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T O P I C R E V I E W
erciyes38	Posted - 10/22/2009 : 07:13:52 AM Origin Ver. OriginPro8 Operating System: Win.Xp I need to plot my data in log10 x scale.But, my data points are negative value points. are any way to solution of the problem?
2 L A T E S T R E P L I E S (Newest First)
erciyes38	Posted - 10/27/2009 : 11:44:52 AM thanks a lot for your help... nicely.
larry_lan	Posted - 10/23/2009 : 01:29:25 AM Hi: Mathematically, what's the value of log(-1)? So it's impossible to use the real logarithm axis. So I supposed your data is in a really wide range and you want to plot them tight. An workaround as below: Column A and B are raw data, and the other columns are: Col(C) = -log(-Col(A)); Col(D) = Col(B); And Column E is just the same data from Column A, but sort ascendingly. Then we will use this column E as axis ticks. Plot column C & D, and double-click the X axis to bring up X Axis property dialog. On Tick Labels tab, use Tick-indexed dataset Type and assign column E to Dataset drop down: Then you will get something like: Note that it's not really log scale. The scale still linear, but we use different tick labels. Hope it helps. Thanks Larry OriginLab Technical Services

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