plotting a graph with different size markers

Hello everyone,

I would like to plot a graph with the data points as circles according to their sizes in diameter. The y-axis is the vertical distance and the x-axis is the horizontal distance. Furthermore, is it possible to colour the points from 1.53x10^-4 to 2.23x10^-4 in red and the rest in blue?

Thanks

Answer 1

[KSSV]

Read about scatter.

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I read about scatter but the problem is my x-axis is not in equal dimensions to scatter as far as I've understood it

[KSSV]

data = xlsread("Data.xlsx") ; 
x = data(:,1) ; 
y = data(:,2) ; 
z = data(:,3) ; 
scatter(x,y,[],x,'filled')

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data = xlsread("Data.xlsx") ; 
x = data(:,1) ; 
y = data(:,2) ; 
z = data(:,3) ; 
sz = linspace(1,300,length(z));
scatter(y,z,sz,'filled','MarkerEdgeColor',[0 0 1],...
              'MarkerFaceColor',[0.5843 0.8157 0.9882],...
              'LineWidth',1.5)
          
        

so that is my code but is there like a code to change the colour for half the values to red. For example there are 146 data points so from 74th data points onwards it should be red

[KSSV]

Read about indexing.

data = xlsread("Data.xlsx") ; 
x = data(:,1) ; 
y = data(:,2) ; 
z = data(:,3) ; 

sz = linspace(1,300,length(z));
scatter(y(1:74),z(1:74),sz(1:74),'filled','MarkerEdgeColor',[0 0 1],...
              'MarkerFaceColor','r',...
              'LineWidth',1.5)
hold on          
scatter(y(75:end),z(75:end),sz(75:end),'filled','MarkerEdgeColor',[0 0 1],...
              'MarkerFaceColor','b',...
              'LineWidth',1.5)
        

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Thanks a lot for your help and recommendations. I've learnt a lot from you