Xy graph Zoom

Hi Guys,
I have a x-y graph. Can i Check how do i zoom into the graph as (my data changes within millimeter ranges) therefore i will hope to zoom in order to view the result significantly.
Cheers,
Scott
Solved!
Go to Solution.

Hi Scott,
I wonder if this is what you're looking for.
Just right click the XY Graph, select Visible Items > Graph Palette
You'll see the graph palette at the bottom of the XY Graph, as shown below
Click the middle button, and you can choose how you want to zoom the XY graph
Hope that helps.
-Ee Lim-
See that button on the left side of this post...
If you feel my post is helpful, all you need is just (at most) 2 seconds to click that button, to show your appreciation. Thank you~~

Similar Messages

XY graph zoom problem

Hello,
There is a issue when you zoom in using a XY graph. Say you have a two points one at 0,0 and another at 10000,10. If you zoom in to say point 5000,5 the centre point the line will be way off nowhere near where it should be crossing. I was wondering if anyone knows a fix for this problem?
Thanks

I agree that this does not look right, but is probably due to limitations in the math used. Once you zoom into the area of iterest, the position of the line actually changes as a function of zoom level. (for example, the 5000 crossing of the line is at 5.00, then at 5.015, then at 5.16). I am sure the accuracy it could be improved, but maybe at a cost of performance.
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XY Graph Zoom Mouse Wheel

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The problem isn't with the notifier mechanism (although that code can be simplified). The problem is with the way you're calculating the new ranges and increments. When the calculations are done the proportions of the graph are not kept consistent, thereby causing a stretching of the "figure". Also, you are not putting a limit on the XScale.Increment and YScale.Increment such as when you hit the max/min scale ranges. This means that you can continue to "zoom out", with no chance in the scale, but the increment values keep increasing. This throws off the calculations when you try to "zoom back in".
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Graph Zoom In/Out

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How can I display more graph data than will fit into memory?

I'd like to graph more data than will fit into my computer's memory on a LabVIEW graph or some other LabVIEW control. In the past I've hacked this with the 2D Picture Control. LabVIEW would read through the huge file one chunk of manageable memory at a time and fill in the appropriate pixels in the 2D Picture Control as it read through the file.
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Looks like mikeporter has done most of the heavy lifting for you in his excellent article.
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Automate annotation locations

Hi,
I've been trying out the Annotations in LabVIEW 8.5 and they work well except for a few issues I tend to be having. I have a grpah that needs 5 annotations in them, but they may be anywhere in the graph. What I am trying to avoid is overlap between the annotation labels together. Here are some examples of what I am talking about. The first graph shows a bunch of annotations all overlaping. I zoom in on the graph and they reorder properly and look clean, but I can not allow the graph to always just zoom in on the annotations, I need the graph to be the full view. So the last graph shows how I would like the annotations to automatically orient themselves with each other to get a best fit around the cursor points without overlapping their own space.
Graph As Is
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Kevin Shirey
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Certified LabVIEW Developer

So I’ve gotten the Annotations to a ‘usable’ solution for our product. I ended up adding a lot of code to make the usability easier for the user and as fully featured as I could. I submitted a product suggestion form as well. I also documented it all in a word doc for you so look for the attachment with more graphs. I also have some example code I can provide for what I have done.
Improvements I’ve been able to account for:
Y offset to annotation label based on crosshair size
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Label in + or – Dimension from the crosshair
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Event Structure Code to automate replotting the visible Annotations
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PVI Systems Inc.
Certified LabVIEW Developer
Attachments:
annotations.doc ‏744 KB

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•Support for Private Data Sources
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Nandha
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Anyone worked on LabVIEW PDA module for Pocket PC?

LabVIEW 7.1 PDA Module is claimed having the new features:
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Installing the driver for the NI PCMCIA-4050 is a little more complicated than other installations. You will have to follow the exact procedure stated in the "NI 4050 for PDA Readme.htm" file. I pasted the important information here:
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Place nirlpdriver.dll and NI4050DLL.dll in the \Windows directory
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Copy the ni4050.mnu file into the C:\Program Files\National Instruments\LabVIEW 7.1\user.lib folder
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Copy the LabVIEW\Examples\NI4050 folder into C:\Program Files\National Instruments\LabVIEW 7.1\examples\PDA
Getting Started
Before the NI-4050 will be recognized by the PDA, you must run the NIRLP 4050.exe. This EXE will install the registries needed by the PDA to recognize the hardware as well as a test routine which allows you to verify that the device is properly installed.
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Questions about decimation and zoom in graphs

I am currently developing an application in which the size of the signals I have to display in different graphs is quite large (8 Mbs of DBLs, for example). I was thinking about reducing the amount of memory used when I found a document at National Instruments Developer Zone (http://zone.ni.com/devzone/conceptd.nsf/webmain/6A56C174EABA7BBD86256E58005D9712?opendocument), and inside that paper there was a paragrpah, "Fast Data Display with Decimation", that was perfectly suitable to me.
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Thanks in advance and have a nice day,
spj

The things you say in your comment are right. In fact, that was what I had to do to fix the problem. Let me explain myself a little further.
I needed to reduce the memory, so I decimated the signal. To take care of the zoom bussiness, in my Diagram Block I put an event case to warn me when the mouse left the graph in order to do exactly what you have mentioned: with the original signal and the new limits, being aware of the x-multiplier, re-decimate the signal if necessary.
But that is when my problem arises. I am not able to distinguish when the user is really zooming the signal or merely touching the graph, without zooming anything. Now you can see the reason of my questions.
Thanks for your interest, Joe, and have a nice day,
spj

Zoom bar error in OBIEE11g(version:11.1.1.5.0) in Graph view reports.

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Error message:An error occured while processing your request.Please contact your site administrator.
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Oracle BI ODBC Client
Copyright (c) 1997-2011 Oracle Corporation, All rights reserved
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[nQSError: 47001] Invalid Oracle BI Bin directory:
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Initialize client environment failed, possibly caused by incomplete installation
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[0][State: IM004] [DataDirect][ODBC lib] Driver's SQLAllocHandle on SQL_HANDLE_ENV failed Connect open failed

Has anyone "zoomed in" on a portion of a waveform graph?

Has anyone ever used two cursors to zoom in on a portion of a waveform graph?
I've seen that newer Oscilloscopes offer features to do this both horizontally and vertically.
See the attached jpg for an example of what I'm trying to do. It is from Google Finance. Notice the area circled in red. The two cursors define the portion of the waveform to be displayed on the main graph. There is also a scrollbar beneath them which allows the user to quickly move the zoomed-in area across the graph- I would love to have that functionality on the LabVIEW graphs.
My first thought is that I can do this using mostly property nodes. Not sure on vertical zooming scrolling the horizontal zoom- I'm thinking maybe this would best be done using scrollbars which are not part of the graph itself.
Any ideas or comments?
Thanks,
Dave
Attachments:
deleteme.jpg ‏38 KB

Cursor position is available in Labview via a property node. You can also set about every chart property with property nodes. I have used this many times. Here is a trick. If you have two cursors, Make separate arrays of the x and y positions. Then use the "Array max&min" to sort them. This will make your program independent of the cursor sequence.
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

I have some trouble With the graph XY, if I display a curve and try to zoom on it, it may be corrupted, or may disappeared.

In fact this happens on some computers. the graph XY causes some trouble when zooming. Sometimes, when I run my main program and open the window with the graph, it has change the displayed it overflows to the edge of the windows. Or somtimes it works but if I zoom the curves disappeared, or is corrupted.
I have this for instance on a computer with win 98 and a ATI graphic board. So I try to update all drivers but noting has changed. I try to decrease the hardware acceleration, and it seems to happen less oftenly.
Does anybody have seen that kind of trouble ?

> I have some trouble With the graph XY, if I display a curve and try to
> zoom on it, it may be corrupted, or may disappeared.
>
I think what you are describing is not due to video driver, but rather
to the way the graph works. The LV graph maps points to integer screen
coordinates and draws lines be tween those point. When the numbers are
way to large to fit on the screen, the numbers are pinned to a special
large value. When this happenson one axis but not the other, it causes
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zoom into the data by a large extent, pushing the other points about ten
to fifteen monitors away. At this point you are no longer
looking at
measured data, but rather just on the interpolation of a line between
two points. The solution if you must have one is to resample your data
on the diagram to contain more points.
Greg McKaskle

Is there a function to have a graph with both the full signal and a zoomed in signal displayed?

See the Jpeg attached. Ive created this using 2 seperate graphs. Ideally Id like to do it using a single graph. Is this possible?
Solved!
Go to Solution.
Attachments:
NI.JPG ‏38 KB

If you plot the same data as two seperate plots
AND
You create two seperate X and Y Scales
AND
You associate one plot with each scale pair of of XY scales.
Then you will be able to change the range of one set of scales to achieve an effect similar to zooming in on one.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

How to record and plot only the zoomed portion of a Graph or Chart?

I'm using LabVIEW 8.6 and have problem plotting only zoomed part of a graph or chart onto other. Please help.

Sorry, your VI makes absolutely no sense. First you slowly generate chart data, then you write it to a file, read it back from a file, do some exceedingly elaborate while loop that could be done with almost no code at all, then chart all data at once again. The stop button in the while loop makes no sense, because the while loop executes so fast that it is not possible to actually stop it while it is running, only if the button has already been pressed during the first FOR loop.
What is the purpose of the two arrays? They don't seem to serve any purpose. Why are you getting the array size with every iteration of the loop? Once, right before the loop should be enough. Index array is resizable, so only one instance is enough. Instead, array to cluster is probably all you need.
The sequence structure is only needed because you write, and then immediately read from the file. All you probably need is to write to the file and wire the 2D array to the seconds structure. Now we have a data dependency and the sequence structure is no longer needed.
Can you tell us a little more how you are zooming. Do you want to zoom any of the two graphs and automatically zoom the other accordingly?
As it currently stands, only the first chart gets data, so zooming the other one seems useless. Once the second chart has data, the VI stops and you can't do much either programmatically. Please explain how you are zooming.
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Xy graph Zoom

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