Plotting circles on a 2D graph

Hello everyone,

I'm trying to plot a graph showing distribution of some data with different size. So I need to plot it on a 2D graph according to size. So basically I would like to define where the droplets are on the x axis according to size as the y will be 0 except for the the initial beige amount of droplets. How do I define the position on the x-axis and the frequency of the droplets and the best way to project it on to these two axes? For example, the 2000 micrometer is on the y-axis at 0 and x-axis 0.06m.

Thanks

Answer 1

[KSSV]

If you know radius and center of cricle, you can plot circle as below:

C = rand(1,2) ; % center of circle 
R = 1. ; % RAdius of circle 
th = linspace(0,2*pi) ;
x = C(1)+R*cos(th) ;
y = C(2)+R*sin(th) ;
plot(x,y)

In your case, you can use scatter also. Read about it.

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x = linspace(0,3*pi,200);

y = cos(x);

sz = linspace(1,100,200);

c = linspace(1,10,length(x));

scatter(x,y,sz,c,'filled')

So I read about this scatter function but I'm not quite sure how it works. I have 29 different sizes and all of them on the y=0. Since I have 29 different sizes should I make a matrix? But I'm not sure how to proceed with it then. I have attached my raw data on the excel file. The frequency is the amount of droplets of the same size and the rest is scattered on the y = 0 axis. The formula to caluate x is in the excel file which is pretty easy.

[KSSV]

num = xlsread("Raw data.xlsx") ; 
R = num(:,1) ;   % sizes 
x = 1:length(R) ; 
y = zeros(size(R)) ; 
scatter(x,y,R,R,'filled')

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I just tried that and it's something that I think fits well but the x-axis values are wrong. It's supposed to be from 0 to 1.18 but this is going till 30. And how do I make the circles in a descending order of sizes instead of ascending? So like big circles at the beginning and small ones at the end?

Thanks for your help

[KSSV]

num = xlsread("Raw data.xlsx") ; 
R = num(:,1) ;   % sizes 
x = linspace(0,1.18,length(R)) ; 
y = zeros(size(R)) ; 
R = R(end:-1:1) ; % Reverse R
scatter(x,y,R,R,'filled')

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thank you. it works