How do I change the x-axis to read in log scale?

[RichardSAhrens]

I go into the properties and go to the scales tab.  Then I change the x-axis to a log scale by checking the box, but the change is never saved.  Does anyone know how to fix this?

Also, I am pretty new at this and I am self taught so I was trying to figure out how to have a real time plot of a dynamic data vs. another dynamic data, how do you achieve this because all the charts are vs time scale and from what I have read graphs are not used for real time plotting.

Rick

[altenbach]

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RichardSAhrens wrote:

I go into the properties and go to the scales tab.  Then I change the x-axis to a log scale by checking the box, but the change is never saved.  Does anyone know how to fix this?

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 Logarithmic x-scales only work for graphs and not for charts. It should be greyed out for charts, so this is a UI bug.

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RichardSAhrens wrote:

Also, I am pretty new at this and I am self taught so I was trying to figure out how to have a real time plot of a dynamic data vs. another dynamic data, how do you achieve this because all the charts are vs time scale and from what I have read graphs are not used for real time plotting.

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 Use the xy-graph from the express palette, then configure the "built xy-graph" express node not to clear data between calls.

[RichardSAhrens]

So I put in the express build xy graph so that I could use log time.  Now nothing comes up when I try to run.  I think this is because I have nothing going into the time.  If I wire the iteration into the express build xy there does not appear any connected data. 

[altenbach]

Most likely there is a simple fix. Why don't you attach your VI to make it clear what you're doing. 🙂

[altenbach]

Here's a very simple draft (LV 8.5) that seems to work just fine. Of course it won't graph the x=0 point, because it can't 😉

Message Edited by altenbach on 11-08-2008 04:26 PM