polar plot bar chart combo or something similar?

Hello,

I have 24 spaced angles such as:

[100],

[10tan(15)],

[10tan(30)]

etc.

Note that tan is in degrees.

For each of these angles I have a value. How can I plot a line of that magnitude at each angle? Can MATLAB handle something like this?

Answer 1

[Walter Roberson]

deg = 0:15:359;
theta = 10*tand(deg);
rho = the values corresponding to each angle

polar(theta, rho)

or

polarplot(theta, rho)       %recommended if your MATLAB is new enoug

[Benjamin Cowen]

Not sure that this works. Let's say i have two data sets, a, and b. In variable "a" I have a column in degrees of all my angles. Variable "b" has a column of data of the magnitude of each line. So I want 24 lines starting from the origin and going towards their angles with the appropriate magnitude of variable b. Is there a code that can just interpret my variables a and b like this? With the plot you did I get zigzags all over the polar plot.

[Walter Roberson]

But possibly you want:

polar([theta;theta], [zeros(size(rho));rho])

[Benjamin Cowen]

How do I add points at each spot. I see a zig-zagged line, but how can I add a point at each value to highlight where they are?

[Walter Roberson]

The revised version

polar([theta;theta], [zeros(size(rho));rho])

does not generate zig-zagged lines.

The zig-zag lines are due to the fact that you specified that your angles are to be 10*tand(0:15:345) which give angles in radians that are all over the place, including +/- infinity.

If you have a column "a" with angles in degrees,

theta = reshape(a*pi/180, 1, []);  %want a row output
rho = reshape(b, 1, []);           %want a row
polar([theta;theta], [zeros(size(rho));rho])

You could add markers:

polar([theta;theta], [zeros(size(rho));rho], '-*')

Answer 2

[KAE]

You might want to see windRose on the file exchange.

Answer 3

[John BG]

Mr Cowen

simplifying for just 5 sections

with a start point set to [10 10]

with possible angles multiple of of let's say 15º

amount_angles=5;
da=15;
a_range=[0:da:360-da];
na=randi([1 numel(a_range)],1,amount_angles);

a=a_range(na);  % angles  
d=randi([100 1000],1,amount_angles);   % section lengths

p0=[10 10]
figure(1);grid on

plot(p0(1),p0(2),'go')

hold all;

for k=1:1:numel(a)

dx=d(k)*sind(a(k))
dy=d(k)*cosd(a(k))

plot([p0(1) p0(1)+dx],[p0(2) p0(2)+dy],'b')
plot(p0(1)+dx,p0(2)+dy,'ro')

p0(1)=p0(1)+dx
p0(2)=p0(2)+dy

end

I have repeated twice and the green point is the start point while the red points are way points, and in blue each section:

.

Mr Cowen if you find this answer useful would you please be so kind to mark my answer as Accepted Answer?

To any other reader, please if you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John BG

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