Multiple polar plots into a 3d plot

my test measures a light source, for each iteration (of the test) the detector moves up in elevation 5 deg (starts at 0 deg) and takes a data point every 2.5 degrees in azimuth (for a full 360 deg). My data array is a 3d array where on each page I have 3 columns azimuth, elevation (the elevation is constant for each iteration) and measured data. The question is: I cannot seem to plot it into a 3D graph...polar plot no problem...does any one have any insight?

“Create color map.JPG” illustrates one way to create the map for the forth dimension.
“Set Axis Range.JPG” how I manipulated the axis range and properties. Note: It appears all CW 3-d graph items start counting at “1” not “0”.
“Add Cursors.JPG” shows the cursor work.
I hope this helps,
Ben
Message Edited by Ben on 09-24-2005 03:48 PM
Message Edited by Ben on 09-24-2005 03:49 PM
Message Edited by Ben on 09-24-2005 03:49 PM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
Create color map.JPG ‏37 KB
Set Axis Range.JPG ‏71 KB
Add Cursors.JPG ‏62 KB

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How can I change the Y-axis (circular) grid spacing, in Polar Plot VI?

When using Polar Plot VI, I need more control over the plotting parameters. This means tweaking the sub-VIs in various ways. What I need to do most is make the polar magnitude axis less busy, i.e. only draw circles every 10 instead of every 5 divisions, when using a range of 0 (outermost) to -80 (innermost).
The magic 'magnitude axis subdivisions' variable seems to be generated in Calc Scale Specs sub-VI, and output as an array of clusters, but I can't quite see how it's created and from what.
Please can anyone help me gain control over the number of magnitude division circles generated?
Many thanks!

I think if you go inside the Calc Increment.vi and modify the Increment output terminal it might change what you want to see. Try putting a multiply by 5 or ten into the case structure for when the log is false.
Attachments:
polar plot calc increment.jpg ‏90 KB
modify calc increment.jpg ‏104 KB

Problem using read from spreadsheet file and polar plotting

Hi to all labview users,
i am a beginner in labview and i am trying to do a polar plot.
i read the polar plotting example in labview and it was straightforward.
I used "write to spreadsheet file" to gather data.
and they are in the following format
13 10
4 20
8 30
....etc
now. i tried using "read from spreadfile" to get the data into a array, then using "array to cluster" to convert the array into cluster, so i could connect it to the polar plot block
however, it kept saying i couldnt connect that way, because polar plot uses 1-d array with cluster of 2 element and my source is a cluster of 9 elements....
but doesnt the "read from spreadfile" block give me a 1-d array? and where does that 9 come from? i only have 3 rows and 2 columns in my data file....
any guidance would be greatly appreciated.
thx alot
Happy guy
~ currently final year undergraduate in Electrical Engr. Graduating soon! Yes!
~ currently looking for jobs : any position related to engineering, labview, programming, tech support would be great.
~ humber learner of LabVIEW lvl: beginner-intermediate

Helllo,
I've made an example to try to help you with that question.
Notes:
- the file must have values separeted by tab
- reading the values from file as you mentioned using "read from spreadfile" you'll get a 2D array and not 1D;
Software developer
www.mcm-electronics.com
PS: Don't forget to rate a good anwser ; )
Currently using Labview 2011
PORTUGAL
Attachments:
Read Table and plot polar graph.vi ‏26 KB
teste.txt ‏1 KB

50G / simultaneous multiple scatter plots + intersection of linear regression lines

I have a real specific problem with scatter plots and linear regression lines.
First, I've been looking over the manual and the internet trying to figure out how to graph multiple scatter plots at the same time, but it seems like you can only do Columns 1 and 2 or Columns 1 and 3, etc., from Edat (greek letter), you can't do all three columns at once IF Column 1 represents X and 2 and 3 represent Y-values. Or columns 1 & 2 as one set, and 3 & 4 as a second set.
Further, because it doesn't seem to be able to do this, I can't get it to find the intersection of these two lines. I can get the x-intercept and y-intercept just fine but I don't need that. What I can do is do a linear regression on both sets of data to get an equation for a line, put it into an array, and use the solver on it, that does indeed work. But that's a whole lot of extra keypresses just to get an ordered pair. I have experience on TI and Casio calculators and they don't have this seeming limitation.
Any suggestions?

I have a real specific problem with scatter plots and linear regression lines.
First, I've been looking over the manual and the internet trying to figure out how to graph multiple scatter plots at the same time, but it seems like you can only do Columns 1 and 2 or Columns 1 and 3, etc., from Edat (greek letter), you can't do all three columns at once IF Column 1 represents X and 2 and 3 represent Y-values. Or columns 1 & 2 as one set, and 3 & 4 as a second set.
Further, because it doesn't seem to be able to do this, I can't get it to find the intersection of these two lines. I can get the x-intercept and y-intercept just fine but I don't need that. What I can do is do a linear regression on both sets of data to get an equation for a line, put it into an array, and use the solver on it, that does indeed work. But that's a whole lot of extra keypresses just to get an ordered pair. I have experience on TI and Casio calculators and they don't have this seeming limitation.
Any suggestions?

Colour in area underneath a curve on a polar plot

Hi i have made a VI that shows a curve on a line, i have also made a vi that outputs a mpeg video of the graph panning through all of its values, what i was wondering was if it was possible to fill in the area within a curve? I've managed to set the line colour, but i am unable to find anywhere that lets you set area colour.
Many thanks.
John P.
VI attatched, bits cluttered, but the polar plot is clearly visable at the center.
Attachments:
Cosine Lobe Model.vi ‏98 KB

Very nice unclebump,
You get 5 stars for that one To help people new with LabVIEW I decided to attach a picture showing you where to navigate to make the change. You need to change the logic constant from false to true in the Polar Plot Data.vi (Labeled Polar Data) under the Polar Plot.vi (No Label just a picture of a polar plot). The plot comes out filled because it is a multiple line graph drawn in a picture node with the line fill option on.
Regards,
-SS
Message Edited by ShotSimon on 08-27-2008 09:25 AM
Attachments:
Polar Filled.PNG ‏50 KB

Polar plot of a data matrix....help is needed

Hello,
I'm working on an Ultrasound project, the data coming from the device is transmitted through a USB driver to the PC. I made a VI, that open a connection with the USB device and recieve the data. The coming data are recognized by the LabVIEW as stream of strings, so, i converted the data into a bytes using "string to byte array" function, then I used the function "reshape array" to reshape the data bytes into a 512x64 matrix which represents the no. of samples per ultrasound line times the no. of ultrasound lines.
I plotted the data on an intensity graph function and it worked, but the problem is that the data or the matrix must be plotted as a polar plot, not as a cartesian plot.
The problem is that I want to convert each single pixel (byte) of the (512x64) matrix from having (x,y) coordinate into a pixel that has (r, angle) coordinate.
can you help me plot these data in a polar plot. If any body has any suggestions please help.
best regards,
Underzero.
Attachments:
US_VI1.PNG ‏17 KB

Multiple posts: keep discussion to this thread: http://forums.ni.com/ni/board/message?board.id=170&thread.id=337220

How do u modify polar plots

I would like to modify/control as many features on a polar plot as possible. I am aware of the property node feature, but those seem to be limited in what can be modified. I would like to have control over plot line thickness, fill-in solid color under data, and text size. I have seen these things modified before but I can't figure it out myself. Has anyone had this same issue?
Thanks!
Solved!
Go to Solution.

robin533,
It sounds like with as much customization as you want, you might have to dig deep in the code. I would suggest trying to get into the low level code of the Polar Plot VI and seeing if you can modify what it is you're looking for. You can access some pen controls and color options this way.
Cheers!
KyleP
Applications Engineer
National Instruments

How to clear polar plot Programmatically

How to clear polar plot Programmatically, thanks!

This doesn't technically clear the plot, it's writing an array of zeroes to it. But if all you want is to make the plot appear to dissapear that's ok.
I've taken a closer look and found that you have to use the Erase First property node to set which pictures can be erased. The default is never erase any, which is why the plot doesn't clear.
Then, you can get an empty picture constant from the pictures sub-pallet and wire that into the Value (Signalling) property node and it will work.
I have attached one VI with and one without the event structure to tidy things up, but you may not have the event structure available to you. I wrote these in LV2012.
Attachments:
PolarPlotV1.vi ‏16 KB
PolarPlotV2.vi ‏22 KB

How can I increase line width on polar plot?

The lines plotted on a LabVIEW 6 polar plot (picture control) are very thin and do not show up well when printed. I would like to increase the line thickness (as can be done easily on the graph controls), but looking through the polar plot VIs, I cannot find any obvious way of doing this.

The polar plots basically use the picture control to draw the lines on a plot. To increase the thickness of the lines you would have to draw another line right next to the line. I'm sure this could be done, but would require alot of messing about with the drawing subVI's to draw all lines in duplicate.
Alternatively you could plot the graph twice, but the second plot has an origin 1 pixel out. This will double the thickness on the screen, but i dont know what it will print out like. See attached example in LV 6.0.
Another thing to try is change the plot colours. You can make the gridlines black (instead of grey), and paint the background white. This makes the lines show up much better. I will also include this in the same example.
I hop
e this helps you..
Kim
Attachments:
Polar_plot_lines.vi ‏37 KB

I would like to use a polar plot in the application now I am developing.

Is there any kind of custom control or FP wich allows me to implement this kind of graph with CVI ?. (of course without doing Rec 2 Polar transformation and PlotXY).
Thanks in advance,
José M.

There currently is not a custom control for doing polar style plots in CVI. There is only one for smith charts. You can use the standard 2D-graph to create polar plots with the help our analysis libraries, or if you need a more custom display, you could draw your own plots in a canvas control.
Best Regards,
Chris Matthews

Polar plot with legend points

I can put one Polar Plot with legend in points?
Case:
I have magnitude and phase arrays for build polar plot and i want put rotation legend in each point of measurement. Then we have 3 arrays (magnitude, phase and rotation), but rotation need stay like legend for each point.
Somebody already do it?
thx for tip.
Leonardo de S. Cavadas
Maintenance Engineer and Inspection - Bureau Veritas do Brasil
Engineer Metallurgist with emphasis in Advanced Materials
Technologist in Computer Science

Unclebump,
i do one simple modification to be possible add rotation value to image, isn't better solution but i think that i'm near to solution way. Look these VIs, Re-link is necessary.
Leonardo de S. Cavadas
Maintenance Engineer and Inspection - Bureau Veritas do Brasil
Engineer Metallurgist with emphasis in Advanced Materials
Technologist in Computer Science
Attachments:
Plot Polar Data with Legend.vi ‏74 KB
OtherPolarPlot.vi ‏67 KB
Polar Plot with Legend.vi ‏75 KB

How to interpolate impedance measurements in a polar plot

Hello,
I do impedance measurements and plot them afterwards in a polar plot (see attached VI). Because of a sharp resonance it is hard to get a high resolution there.
- Is it possible to do an interpolation between the the measured points?
Thanks a lot.
Best regards,
Michael
Solved!
Go to Solution.
Attachments:
Interpolation.vi ‏47 KB

Take a look at the attached. I created an array to resample the data based on the data itself and then used the Resample (constant to variable) to generate interpolated data. This way the resonance is interpolated with more resolution than other locations. Does this do what you want?
There is a constant on the block diagram that controls how much more the resonance will be interpolated.
Message Edited by rpursley8 on 03-22-2010 12:02 PM
Randall Pursley
Attachments:
Interpolation-1.vi ‏76 KB

3D Polar Plot

I want to plot a 3D Polar Plot with Angle Axis as Angle, Radius Axis as Frequency and a third axis representing intensity at that point. For the snap shot of the image i have attached a .jpg file. Give me a perfect solution as soon as possible.
Thank You in advance
Attachments:
3D polar.JPG ‏22 KB

Hi 3D Polar,
well, you could use an intensity plot with embedded background graphics for the grid. Then you only have to plot the intensities after converting polar to rectangular coordinates.
Asking for a "perfect solution" is like wanting all for nothing...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Polar Plot Problem

Hello!!!!
I have created a Polar plot, but there is a line that shouldn't be there, what do I have to modify, so it shows exactly what I want??? I Have attached a picture of the graphs that I want, and my example VI, I hope someone can help me.
Sorry, The arrays have to be filled out whit the next info:
I: -1, 1,-1,1
Q:1,-1,-1,1 THIS WAY IT does what I need.
Saludos.!
Mensaje editado por Special K
Attachments:
img030.jpg ‏305 KB
graficar2.vi ‏43 KB

Special K wrote:
Im using LABVIEW 8.0 how can I create my own polar plot??
You would need to use the picture functions to draw your graph, in the same way that the Picture Plot VI does. If you open up that VI you will see how it's done.
Have you seen the images of what I want to obtain?? Is it possible to create those graphs??
Yes. And yes. The "how" is a different matter. It's quite trivial to create an XY graph to draw your points, so that's why I suggested to use that. If you do not know how to draw an XY graph, open the Example Finder (Help -> Find Examples) and search for "graph". You will see lots of examples on graphs, including one for XY graphs. All you need to do is provide 4 points to the graph, and change the plot type to "scatter" so you just get the points instead of lines. Pretty simple.

How to draw polar plot?

Hi all,
I want to draw a polar plot in LV. I am having different values of frequencies & voltage/current values at respective freuencies. Can anybody guide me?
Vaibhav Gandhi
B.E. Instrumentation & Control,
INDIA

Hi Vaibhav,
LV already has a polar plot indicator and comes with an example of how to use it...
Btw. usually you plot a signal vs. phase on a polar plot. How would you plot vs. a frequency?
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Multiple polar plots into a 3d plot

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