Log axis

Hello,
I am a bit puzzled by the scaling of my log scale...
Say the range is -.2 (or zero) to 17788.
1) Changing the map mode to log I would have expected an error, according to the documentation:
Use a logarithmic scale for the graph axis. The minimum axis value must be greater than zero.
Obviously, it must not.
2) Having the axis autoscaled, the smallest label is 18, with intermediate labels of 100, 1000, 10000, and the largest label is 17788.
Why is the smallest label 18 and not 10, or 1, or 0.1??
I have Auto Divisions but no Loose Fit.
Thanks, Wolfgang
Solved!
Go to Solution.

Hi Wolfgang,
The reason it is being coerced to such a high value is because you have Loose Fit (ATTR_XLOOSE_FIT_AUTOSCALING) enabled for autoscaling and too high of a Loose Fit AutoScale Unit (ATTR_XLOOSE_FIT_AUTOSCALING_UNIT). The autoscaling unit is the log factor that the autoscaling will use for rounding. You probably have the autoscaling unit set to 2 which is the default. This means that it will round to the next higher for max and next lower for min value that is a factor of 100. This works great for a linear scale, but you can see an obvious problem with this design for log scales. By the very nature of the log scale, it does not make sense to round based on the same factor.
The reason you are getting a min value of 18 is because the true min of the data is smaller than the autoscaling loose fit factor. And since it cannot use 0 as the min since it is an invalid value for log, it instead defaults to 1/1000 of the max.
There are a few issues here with loose fit on a log scale, so I have filed a bug report that you can track with ID: 352509.
In the meantime, I found that disabling loose fit allows the autoscale to work correctly even with negative data values. However, if you want to have a loose fit (i.e. you min and max on the scale have a buffer around the min and max of the data), then you will have to implement this yourself. You can use autoscaling when plotting data to automatically detect the max and min of the data, then switch to a fixed scale so that you can then add the buffer region to create a loose fit. Or you can leave autoscaling off and calculate the min and max values yourself.
National Instruments
Product Support Engineer

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Solved!
Go to Solution.

Thank you sooooo much Felix, you made my day !!!
I post the solution if someone needs it
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Attachments:
plottest.zip ‏6 KB

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"Tim " <[email protected]> wrote:
>
We have software that was developed using Axis to connect to a webservice.
It
works fine. However, when we add the software to another system that
is run under
weblogic 5.1 we get the following error when the axis classes are trying
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java.lang.reflect.InvocationTargetException: java.lang.NoClassDefFoundError:
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Tim[happyaxis.jsp]

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Front Panel.png ‏267 KB

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