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### Highlights from 3D Polar Plot

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# 3D Polar Plot

### Ken Garrard (view profile)

01 Dec 2006 (Updated )

Plots 3d polar data with polar axis and polar grid

### Editor's Notes:

This file was selected as MATLAB Central Pick of the Week

File Information
Description

Polarplot3d produces surface, mesh, wireframe and contour plots for three dimensional polar data. A labeled polar axis is drawn at a fixed height or it can follow the surface contour at maximum radius. A polar grid can also be drawn on top of the surface.
This function is based on polar3d by J De Freitas, file exchange ID 7656.

The input parameters are a matrix of magnitudes, Zp, and a list of property,value pairs that modify the default plot behavior. Each column of Zp contains information along a single half-meridian and each row gives height values along a circular arc. By default Zp is assumed to be increasing in radius down each column and increasing in angle (counter-clockwise) along each row. The default plot is drawn over a full circle of unit radius.

'RadialRange' and 'AngularRange' properties can be used to specify the upper and lower angular and radial values over which the data is plotted. The relative ordering of the angular and radial range vectors is used to determine the angular and radial direction sense of the rows and columns of Zp. Alternatively a vector can be specified giving the locations of each row or column.

The polar axis can be placed at the minimum, maximum or mean value of Zp at the largest radius, at the top or bottom of the plot box, at a user specified location, or it can follow the surface at the perimeter of the data. The polar axis tick mark spacing can be adjusted with the 'TickSpacing' property.

The default polar axis orientation is that zero degrees is along the +X axis and increasing angles are counter-clockwise. The 'PolarDirection' property can be used to change this to a compass style plot with zero degrees along the +Y axis and increasing angles going clockwise around the pole.

Default surface coloring is according to the values in Zp. This can be changed by supplying a matrix the same size as Zp as the value of the 'ColorData' property.

A scaling parameter can be specified to interpolate the data onto a finer or coarser mesh. The output Cartesian data is returned in three matrices.

The example plot in the screenshot was produced with the following commands.

[t,r] = meshgrid(linspace(0,2*pi,361),linspace(-4,4,101));
[x,y] = pol2cart(t,r);
P = peaks(x,y); % peaks function on a polar grid

% draw 3d polar plot
figure('Color','white','NumberTitle','off','Name','PolarPlot3d v4.3');
polarplot3d(P,'PlotType','surfn','PolarGrid',{4 24},'TickSpacing',8,...

% set plot attributes
set(gca,'DataAspectRatio',[1 1 10],'View',[-12,38],...
'Xlim',[-4.5 4.5],'Xtick',[-4 -2 0 2 4],...
'Ylim',[-4.5 4.5],'Ytick',[-4 -2 0 2 4]);
title('polarplot3d example');

The zip file contains the polarplot3d function and an m-file with example plots.

Acknowledgements

3 D Polar Plot inspired this file.

MATLAB release MATLAB 7.5 (R2007b)
MATLAB Search Path
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02 Feb 2015 Polychronis

### Polychronis (view profile)

Hi Ken,

Thank you for all the excellent work here!!!!

I have a question. In the following 14 by 16 data matrix:

Data_Right_Arm= [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0.8 1 1 0
0 0 0 0 0 0 0 0.5 0 0 0 0 0.9 1 1 0
0.95 0.5 0.5 0 0.5 1 1 0.95 0 0 0 0 0.6 1 1 1
1 0.95 0.9 1 0.95 0.95 0.9 1 0 0 0 0 0.6 1 1 1
1 1 1 1 0.7 0.95 0.8 0.8 0 0 0 0 0.5 1 0.95 0.95
0.9 0.8 0.85 0.8 0.4 1 1 0.95 0 0 0 0 0.55 1 1 1
1 1 0.85 0.85 0.85 0.8 0.9 0.85 0 0 0 0 0.55 1 0.95 1
1 0.85 0.95 1 0.8 0.95 0.95 0.95 0 0 0 0 0.55 0.95 1 1
0.9 0.8 1 1 0.5 1 0.95 1 0 0 0 0 0.75 1 0.95 0.95
0.85 0.95 0.85 1 0.8 0.95 0.9 0.95 0 0 0 0 0 1 1 0.75
0.9 0.9 1 1 0.7 1 0.9 0.8 0 0 0 0 0 0 0 0.75];

which for each column there is an angle correspondence as follows:

angles_deg=[0 22.5 45 67.5 90 112.5 135 157.5 180 202.5 225 247.5 270 292.5 315 337.5]

I need to create a 3D polar plot grid with the cells containing colours that represent the values of my data matrix from 0 to 1. I tried to use the "polarplot3d" function as follows:

t2 = [11.25 371.25]*pi/180;
r2 = [0 1.5];

%% Plot using default arguments
figure('color','white');
'polargrid',{15 16},'tickspacing',22.5, 'GridScale', [100 100], 'angularrange',t2 );
view([-18 76]);
caxis([0,1.0]);
colorbar('vertical');

But I haven't managed to get the right results. Any suggestions would be greatly appreciate it.

Best,

Akis

30 Jan 2015 Polychronis

### Polychronis (view profile)

30 Oct 2014 Ken Garrard

### Ken Garrard (view profile)

Kelly,
You could try using the return matrices Xi,Yi,Zi to make an interpolating function. Then find z values corresponding to any x,y points you want.

An example, using scatteredInterpolant,

[t,r] = meshgrid(linspace(0,2*pi,361), ...
linspace(-4,4,101));
[x,y] = pol2cart(t,r);
P = peaks(x,y);
angR = [20 350]*pi/180;
figure;
[xi,yi,zi] = ...
polarplot3d(P, ...
'AngularRange',angR, ...
zFun = ...
scatteredInterpolant(xi(:),yi(:),zi(:), ...
'natural');
figure;
surf(x,y,zFun(x,y),'linestyle','none');

Comment only
28 Oct 2014 kelly

### kelly (view profile)

Excellent script; thank you very much for it.

I would like to interpolate across the center of the plot(constituted by the first row or the input vector), as well as between the first and last column of the input vector.

Could you advise me on how to proceed with this?

22 May 2014 Ken Garrard

### Ken Garrard (view profile)

Seb,
I believe this is due to an opengl bug. For example,
figure('renderer','opengl');
polarplot3d(peaks(101),'cartorigin',[10^6 10^8]);
is mangled. But,
figure('renderer','zbuffer');
polarplot3d(peaks(101),'cartorigin',[10^6 10^8]);
looks good. Painters works too but the gridlines aren't drawn very well.

Comment only
21 May 2014 Seb Biass

### Seb Biass (view profile)

Reall good script that does pretty much everything I needed. However, when trying to shift the CartOrigin to projected UTM coordinates (i.e. 10^5 on x and 10^6 on y), the mesh is totally disturbed. Any idea where that occurs?
Cheers!
S

09 Jan 2014 anthony

### anthony (view profile)

Great work !
This code is very helpful for a work about nanoparticles diffusion inside a human cell... Probably not what you thought when creating this code
Anthony

23 Oct 2013 Daniel Zanotta

### Daniel Zanotta (view profile)

Very good! Well writen and easy to use.
Congratulations

18 Oct 2013 Edward Liao

### Edward Liao (view profile)

Good job!
I wonder how to deal with this case, if the distribution of data points is not uniform, for example, data points are more dense with the increase of radial distance, so we use a cell rather than a matrix to store data.

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18 Oct 2013 Edward Liao

### Edward Liao (view profile)

Good job!
I wonder how to deal with this case, if the distribution of data points is not uniform, for example, data points are more dense along radial directions.

15 Apr 2013 Liu

25 Oct 2012 Hans

### Hans (view profile)

09 Feb 2012 Ken Garrard

### Ken Garrard (view profile)

dd,
Line 589 uses a ~ (tilde) character as a placeholder for an unneeded function return value. You must be using a version of Matlab prior to the introduction of this feature. Replace the ~ with an unused variable name such as 'dontcare'.

Comment only
08 Feb 2012 dd

### dd (view profile)

Hi Ken,
I get the following error msg when running the demo code:

??? Error: File: polarplot3d.m Line: 589 Column: 3
Expression or statement is incorrect--possibly unbalanced (, {, or [.

Can you help me on this?

Comment only
25 Dec 2011 Ken Garrard

### Ken Garrard (view profile)

Jim,
The contour function adds Cartesian axes to the figure. I set the 'visible' property of those axes to 'off' in polarplot3d. To turn them on type
set(gca,'visible','on');
after plotting your data with polarplot3d.

If you want only axis labels and a plot title enter
set(get(gca,'xlabel'),'visible','on');
set(get(gca,'ylabel'),'visible','on');
set(get(gca,'title'), 'visible','on);

Comment only
14 Dec 2011 Anson Ting

### Anson Ting (view profile)

13 Dec 2011 Jim Teunas

### Jim Teunas (view profile)

This is very usefull.,,,BUT I have problems with 'contour'....when I run the example with 'surfn' canged to 'contour' all the formating, axis lables, title everything disapears!....what is wrong....could someone send me an example of how to use the contour option?

31 Oct 2011 Ahmed Hassaan

### Ahmed Hassaan (view profile)

16 Sep 2011 Daniel

### Daniel (view profile)

@dimaro - I found a version of "parse_pv_pairs.m" here:

http://www.kemt.fei.tuke.sk/predmety/KEMT515_MT/_materialy/signal/signal/private/parse_pv_pairs.m

With that said, I haven't had a chance to try the script (i.e., 3D Polar plot), so I don't know if it will work

Comment only
15 Sep 2011 dimaro

### dimaro (view profile)

I don't find the parse_pv_pairs function?Can somebody help me?
Thanks.

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19 Mar 2011 Qun HAN

### Qun HAN (view profile)

This is really a good work. Save me a lot of time. Thanks.

15 Feb 2011 Camille Couzi

### Camille Couzi (view profile)

Hi,
I am working with geographic data, so my zero direction (north) is up, and the degrees increase in the way of a clock (so at the inverse as your script).
How can I modify your program in order to be able to use it?
Camille.

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09 Sep 2010 Jérika

### Jérika (view profile)

Got nice plots. Exactly what I needed for pole figures. Thanks!

28 Apr 2010 Virendra

### Virendra (view profile)

05 Apr 2010 Bin Liang

### Bin Liang (view profile)

Awesome work!! I helps me a lot! Thanks!

21 May 2007 Ken Garrard

Dinesh,
You need to download the function parse_pv_pairs (FEX Id 9082). Polarplot3d uses it to process optional input arguments.

Comment only
20 May 2007 Dinesh Bansal

( am using Matlab b) version and I am not able to run this funciton (even for the example given in the code). I get the following error:??? Error using ==> polarplot3d
Error parsing varargin list
??? Undefined function or method 'parse_pv_pairs' for input arguments of type 'struct'.
Can anyone tell me how to circumvent this problem?

Comment only
03 Dec 2006 Ken Garrard

submission update

Thanks for you comments John. I too prefer 'property',value pairs when the argument list is long and have updated my submission to use parse_pv_pairs. Just think what the handle graphics functions would be like without varargin and p,v pairs.

Comment only
02 Dec 2006 John D'Errico

Good documentation, many examples, full of features.

If I look for something to gripe about, I prefer the use of property/value pairs for a code with many optional arguments, most of which will take on their default values.

06 Dec 2006

Changed input arguments to list of 'property',value pairs.

12 Oct 2011

This update supports non-uniform spacing of the rows and columns of the input data matrix, allows more control over the polar grid overlay and removes the dependency on PARSE_PV_PAIRS.

25 Dec 2014