Polar 3d Plot

Hi..
I want to plot the lidar data in the real time as Intensity plot in the
polar plot fashion. Searching an way to make the intensity plot in a
Polar plot window. Is there any existing vi?
Regards
Sandy

HI..
Thanks for that..But this exactly is not that , I want. I want to plot
the scanning data as the attached picture. X axis is Height from the
ground, Y axis is the Distance from the Instrument and Z is the value
of the reflected signal.
Hope I could clearly describe my problem.
Regards
Sandy
Attachments:
try1.jpg ‏1086 KB

Similar Messages

Real-Time updating 2D Polar Intensity Plot

Hello,
I am trying to construct a polar intensity plot. There are a lot of different solutions on the board but 3D graph and pixel by pixel plotting won't cut it for the update time I am looking for.
Think 'weather radar'
My current solution is to use replacePixelLine.vi. I place one end of this line in the center of my picture, and sweep the other end around in a circle. My pixel color data is my intensity levels, I switch data sets everytime I move into another angular bin. Its quick enough to update every ~25ms, which is good for me.
However there is a bad side effect in replacePixelLine.vi that makes all of this pretty much useless. When the line must step diagonally, it moves 1 pixel in both x and y directions, instead of making an L by moving in x, then y. This means that at 45 degrees, this vi draws only 71% of the pixels as 0 degrees. On top of this, instead of scaling the pixel color data, it just lops off what it cannot plot.
Therefore I have a strange situation where my data is plotted in a squarish shape and the angular bins don't 'arc' correctly. The bins are just drawn as straight lines, either horizontally or vertically depending which side of the n*45deg lines you are on.
Is it possible to change internal workings of replacePixelLine?

Hi pschmal,
replacePixelLine.vi is not a VI that is shipped with the Vision Development Module. I assume you are using the IMAQ Get Pixel Line and IMAQ Set Pixel Line within a subVI that is named replacePixelLine.vi. Is this true?
Is it possible for you to post a bit of sample code that demonstrates what you are having problems with. It is easier to diagnose and come up with possible workarounds that way. Thanks!
Kristen H.

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

Control and design applying ramp input and plotting polar coordinates state space

Hi
I am trying to do a fairly simple state space task with Control Design and Simulation toolbox, however I am quite new at using this toolbox and need some help :-)
I want to simulate a MIMO system of a 2-DOF robot arm. The robot arm consists of two links, the first link can rotate arround its origo at its end, and the next link moves inside the first link, in and out.
So the two outputs is define as
r (radius), which is the distance to the end-effector of the robot, and
theta, which is the angular postion of the robot arm
FYI, the two inputs are the currents send to the two motors controlling each link.
I have set up A, B, C and D matrices in the attached VI file and putted it inside a simulation loop.
Now I need help :-)
I want to simulate the system when a ramp input is applied to the two inputs and plot the two outputs in a polar graph to show the end-effectors position when the system is just "let loose". The result should be a spiral (this is verified in MATLAB simulink).
So please, I need help setting up the VI to do the above, can anyone help?
Best regards
Simon
MSc. Eng.
Message Edited by SCMAJA on 10-16-2009 11:21 AM
LabVIEW 8.6 / 2009 / 2010
Vision Development Module 8.6 / 2009 / 2010
VBAI 3.6 / 2010
Attachments:
2 DOF robot with ramp input, polar coordinates plot, state space.vi ‏49 KB

Hello Simon,
The error comes from your Ramp Input. Since your system is MIMO, you would need to feed in a vector input to the system.
I've changed your VI and attached here~!
Andy Chang
National Instruments
LabVIEW Control Design and Simulation
Attachments:
MIMO Robot VI.vi ‏76 KB

How to delete rows from 2D array in this case...

Hello. I'm just begging adventure with labview so please for patient. I created a program whitch suppose work in following way:
2D Input array is array created by FOLDER BROWSING subVI. It works in this way,that browse folder and looking for txt files whose contanins measurment data. In my case subVI founds 4 files,and from theirs headers read information about what kind of data are in file also their's path. In this way is created 2D Input Array. subVI named PLOTS FROM PATHS ARRAY make picture with polar/XY plot. It's create only those plots and legends on one picture as many files(their paths) is setted to the program by output array. I made this subVI in that way and I would not like to change it.
My problem is that in even loop (witch check for any change by user) program suppose to relay anly those rows(files) for which checkbox are marked, e.g. marking anly 1 and 4 box, program should chose from input array row 1 and 4 only and pass them to output array,then PLOTS FROM PATHS ARRAY subVI makes a picture only with 1 and 4 plot and legend only for plot 1 and 4. The best solution would be some relay witch is avtivated by logical signal. It lost to me ideas how to solve it, I'm just in blaind corner...
I tried to use delete from array but I don't know how to do use it properly in this program,becease it can be only before or afeter for loop. Below is scan of front panel and also main problem. Please set me up somehow to solve this problem.
Regards
Solved!
Go to Solution.
Attachments:
plots selector.vi ‏17 KB
problem.PNG ‏18 KB

I have attached a vi. Is this the one that you need?
Anand kumar SP
Senior Project Engineer
Soliton Technologies Pvt Ltd
Attachments:
plot selector modified.vi ‏14 KB

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

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

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

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

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

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

Polar plot scale labels and background colour

Dear Labview Forum,
I am trying to create a polar plot. However when I put the polar
plot indicator on my front panel and wire up some data and parameter
control boxes, the scale labels are missing. See polar plot
basic.VI. Are the scale labels there or are they the same colour
(black) as the background and hence not visible?
When you compare this to the polar plot demo, the background is white and the scale labels are present.
How can I control the polar plot background colour parameter?
How can I control the scale label colour and visibility?
Regards,
Jamie
Message Edited by Jamieg on 01-17-2007 02:18 AM
Using Labview version 8.0
Attachments:
polar plot basic.vi ‏31 KB
Polar Plot Demo.vi ‏33 KB
polar plot basic.vi ‏31 KB
Polar Plot Demo.vi ‏33 KB

I'm so sorry ... i am also unable to find the Propety Node... i think i mistook changing the Label/Caption bg colour as changing the whole bg colour... i'm so sorry...
i've tried searching but to no avail... my apologies...
all the best to your application...
Best Regards,
JQ
LV 8.0 user...

Polar 3d Plot

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