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An implementation of the XY Chart


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    • By Paul Liu
      Hi All,
      I am a new user to LabView and this is my first project using it. The project requires me to read a massive spreadsheet from Excel into LabView and then allowing the user to do the following:
      - Select which columns to plot against the first column
      - Use a cursor to select a portion of the spreadsheet: the Vi will then average the selected data by column (in other words, if the user selects data across multiple columns, the program will average data in each column separately). Then write the averages to the csv file.
      So far, I have the spreadsheet read into a table as strings (because the first row of the spreadsheet is words). I have spent a lot of time searching how to allow the user to select data on the table to perform operations on, but to no avail. I am hoping you guys could give me some insight on how to tackle this project.
    • By torekp
      Here is a graph I made recently, which shows particle number (symbol), material (broad color family), measurement location (exact color), amplitude (X axis) and phase (Y axis).  That's five dimensions in a 2D graph!  There are some obvious limitations.  For instance, there are only 16 symbols, so whatever you're representing by choice of symbol better not have more than 16 categories.  And there are only so many colors, especially if you want them all to be ordered in a spectrum from red to violet.  It gets worse when you try to have "broad color family" like I do here with reddish colors for aluminum and bluish for titanium, because the obvious logical thing to do is to skip over some shades in between the families, reducing the total number of available colors.

      What other options should I consider?  How do you do it?  I don't usually use 3D graphs because (a) they're harder to work with and (b) when I create a report for management, they like to have 2D images they can print out, or view without needing Labview on their computer.
      I'm attaching two VIs I use to create color spectra for my graphs.  I use colors_darken_lighten to darken plots for a white background.  To skip over colors, I obtained 6 colors in my spectrum and reshaped the array to two-by-three, then indexed by measurement location to get the first two colors from each broad color family.
       
      colors_darken_lighten.vi
      plot_color_spectrum.vi
    • By Gan Uesli Starling
      Granted that I could do this very thing with two single-stack charts of 3 traces each. I could do that... However...
      What I'd very much prefer is to have 1 chart with 2 stacks and 3 traces on each.
      So my question is...Can I do that? And if so, how can I do that?
      I'll tell you what this is for...
      I have a test stand measuring pressure and flow. I want to show the current value for each in a separate, vertically stacked plot, with also the current max and min limits as dotted red lines. The settings are progressive steps, each with a different max and min for both those values. I want the operator to not have to think, only just look at the cart, and to know in an instant if it is performing amiss. Also an aid to troubleshooting. Save me a lot of headaches and interruptions down the road.
       
    • By Mike King
      Hi, I figured people here may be more interested in this project. 
       
      I have some cool graph extensions I'm building in an open source project, which make some nice graphical overlays for XY graphs and waveform graphs in LabVIEW.  I've got a github page where you can grab the code, support the project or just have a look at some of the same screenshots.
       
      Everything updates live in the graph, so you really need to see it, to get how it all works, so here you go:
      https://github.com/unipsycho/Graph-Extensions-LabVIEW
       
      Please star follow the project if you want to see this developed and I'd appreciate any feedback or ideas to extend it further.  The markers are very much IN development right now, so no where near finished, but the tools can still be seen working.  THANKS!
       


       

    • By codcoder
      Hi guys,
       
      I'm trying to programmatically update the names of five plots in a digital waveform graph. The plots are in a particular order which corresponds neatly withe the order in the legend as in the order under the "Plots" tab in the properties window.
      However when I try to update the Plot.Name property for each plot by stepping through the ActPlot property the order seems to be 1-2-3-4-0, i.e. when I try to change the name of ActPlot=0 it affects the last plot instead of the first.
      What gives? Is there any other indexing property instead of ActPlot I can use which LabVIEW uses to keep track of the plot order? I'm just updating an old vi so it would be nice if it could be solved without altering the waveform used as an input to the graph.
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