topic Re: Waveform graph bug found while displaying X scale (screenshot) in LabVIEW

Waveform graph bug found while displaying X scale (screenshot)

Derek_Steinkamp — Tue, 15 Feb 2005 21:42:56 GMT

Hi everyone... this is my first post here, however I think I have found a pretty large bug! Let me give a little background infomormation on what I am trying to do). My VI takes an arbitrary amount of databuffers that have been recorded at various sample rates and for differing lengths of time and graphs the data on a single waveform graph. With the different sample rates, sample start/stop times, and sample durations I have been making sure that each plot is correctly bundled with an appropriate X0 and deltaX, and also correlated with the correct Y scale. All of the "heavy lifting" of associating plots with the correct Y-scales and labels is done with property nodes (ActPlot, ActYScl, YScale.Offset, YScale.Multiplier, YScale.NameLbl.Text, etc). Furthermore, I manually set the min/max on both Y Scales, as well as the min/max on the X scale.

Now, the problem: It seems that somewhere in the process of changing all of these properties, that LabView got confused on what/how much it should actually be displaying. Here is the image, problem areas in the red box.

I have tried changing __ALL__ options on the X-scale, and even removing the extra Y-scale (it seems to be not displaying the section about the width of the 2nd Y Scale Label). Each time the VI runs, I manually set the min. to -3E-6 and the make to 1.1E-5

Can anyone figure out what the heck is going on that would cause Labview to not display all of the data within the min/max range, or to display whitespace beyond the (in this case) maximum?

Any help appreciated,

Derek Steinkamp
derekste [at] fnal [dot] gov
Accelerator Division, Fermi National Accelerator Laboratory

Re: Waveform graph bug found while displaying X scale (screenshot)

Derek_Steinkamp — Wed, 16 Feb 2005 09:04:52 GMT

bump. Could really use some help on this one, guys!

Re: Waveform graph bug found while displaying X scale (screenshot)

Dennis_Knutson — Wed, 16 Feb 2005 14:50:51 GMT

Can you post your VI or maybe just the graph and actual data?

Re: Waveform graph bug found while displaying X scale (screenshot)

Derek_Steinkamp — Wed, 16 Feb 2005 15:02:50 GMT

Ok, here are two images. The first is the data I am graphing completely unaltered in a cookie-cutter, all-default waveform graph. The second graph is the modified graph from my program.

VI is attached, but it will be missing lots of SubVIs... however, most of the important graph stuff will be apparent.

Re: Waveform graph bug found while displaying X scale (screenshot)

Derek_Steinkamp — Wed, 16 Feb 2005 15:04:35 GMT

One thing I should point out is that, in all cases, the data is dead-on correct. The only problem is that the scale is shifted past the range of visibility like I highlighed in the original post.

Re: Waveform graph bug found while displaying X scale (screenshot)

altenbach — Wed, 16 Feb 2005 15:15:54 GMT

I've see that before...

Do the following:

(1) Right-click on the graph ---> "advanced ... reset scale layout"?
(2) Right-click on the Volts scale ---> "swap sides"
(3) repeat for all graphs with bad scales.

That should fix it.

Re: Waveform graph bug found while displaying X scale (screenshot)

Derek_Steinkamp — Wed, 16 Feb 2005 15:21:21 GMT

altenbach, that fix worked! Thank you very much... I was not looking forward to re-linking 75 property nodes 🙂 Any idea how this is caused? I didn't notice when it happened the first time around.

Re: Waveform graph bug found while displaying X scale (screenshot)

Ben — Thu, 17 Feb 2005 14:00:03 GMT

This sounds similar to the bugs CC ws chasing back in November of last year.

Here is one of his posting.

http://forums.ni.com/ni/board/message?board.id=170&message.id=98008#M98008

He was working and reporting quite a few graph related bugs back then.

Check his list of answers. It only about 400 answrs back or so.

Check With NI to see if this is fixed yet.

I did not remember reading about this being fixed in the LV 7.1.1 release.

many of these bugs were prompted due to re-scaling taking place. It did not matter if it was auto-scale or otherwise. Hiding the scale and re-scaling was even worse. I posted a variation on one of his original bugs that showed that the graph would keep shifting right until it was no longer visable.

Check with NI and let us know what is the state of the bug fix.

Trying to help,

Ben

Re: Waveform graph bug found while displaying X scale (screenshot)

Ben — Thu, 17 Feb 2005 14:15:17 GMT

Here is the zip I posted for CC's bug.

BTW

How did you get images to show up in your post?

Ben

Re: Waveform graph bug found while displaying X scale (screenshot)

Derek_Steinkamp — Thu, 17 Feb 2005 14:47:56 GMT

You can get images in your post if you use HTML [img src="http://www..."][/img] tags (replace [,] with <,>) to link to an image hosted somewhere else.

Re: Waveform graph bug found while displaying X scale (screenshot)

Barneyho — Thu, 06 Oct 2005 20:19:11 GMT

Derek, did you have to keep your volts scale on the left side then? I've got this issue and still can't seem to make it work. I need my 'volts' to stay on the left side of the screen (just because thats where it was while my program was running LabVIEW 6.1).

Re: Waveform graph bug found while displaying X scale (screenshot)

altenbach — Fri, 07 Oct 2005 14:20:30 GMT

@Barneyho wrote:
Derek, did you have to keep your volts scale on the left side then? I've got this issue and still can't seem to make it work. I need my 'volts' to stay on the left side of the screen (just because thats where it was while my program was running LabVIEW 6.1).

First, you need to do the "Reset Scale Layout". All scales will now be on the left. This is already what you want, right?
If you want any of the y-scales on the right, you can right-click on the desired scale and select "Swap Sides".

The x-scale alignment will remain OK. Have you tried this?

Re: Waveform graph bug found while displaying X scale (screenshot)

Barneyho — Fri, 07 Oct 2005 17:02:47 GMT

When I tried this on my real VI it reset the layout so all of my graphs were now overlapping each other and without re-sizing them it seemed to work. However, I then resized them and the problem returned. I also tried it on my test VI and even without re-sizing the 'reset scale layout' did not work. Do you think its a cluster issue? The reason I put it in a cluster is so that I can make it visible and invisible easily. I could take it out and have 9 separate graphs if that would help but I'd rather not.

When you do the auto-scale on this test VI I have attached does it work for you?

Re: Waveform graph bug found while displaying X scale (screenshot)

altenbach — Fri, 07 Oct 2005 17:52:44 GMT

You seem to have a somewhat different problem.

First, you need to disable "Auto adjust scales" for all charts, this causes the plot size to change depending on the space needed for the axis. You should also change the formatting of the y-scales for e.g. a fixed number of decimal digits so their lenght does not jump as much depending on scaling. Leave enough room for the largest expected numbers. Since you only have one x-axis you must ensure that all plots remain aligned. Autoadjust scales is this not allowed.

You should also do a "Reset scale layout", then resize the graph to the desired size using the outer boundaries, not the graph area. This avoids all the overlap. (remove the transparency on the background temporarily for better control).

See how far you get. 🙂

Re: Waveform graph bug found while displaying X scale (screenshot)

Ben — Tue, 11 Oct 2005 19:54:20 GMT

Nice Post Christian!

I had written this bug off.

This thread has been added to the "Interesting" list here.

http://forums.ni.com/ni/board/message?board.id=BreakPoint&message.id=1117

Ben

Re: Waveform graph bug found while displaying X scale (screenshot)

Err — Fri, 25 Aug 2006 07:59:35 GMT

Re: Waveform graph bug found while displaying X scale (screenshot)

Thaison_V — Mon, 28 Aug 2006 18:29:46 GMT

Hi Err,

Can you please provide more information about what your post in this thread is about? I don't see a direct correlation between your code and the contents of this thread (which was from almost a year ago!). Is your post in this thread related to the thread you started here? If so, please keep all related questions within the same forum thread, so it's easier for other forums to track. Thanks!

Thaison V
Applications Engineer
National Instruments