Why scatterplot shows one point in different color and rest all the points are different?

Hello,

I've made a scatterplot as shown below. As it's clearly seen that one point in the scatterplot is of purple color. I can't fgure out why its like this. If I remove this point from my data, the values in the next row are shown in purple. If I remove this row also, it then moves to the next row. Why it is like this. Here is my code for this scatterplot.

Data=readtable('E:\Table\Data11.xlsx', 'Sheet', 1, 'ReadVariableNames', true, 'VariableNamingRule','preserve');
Data.Aerosols=1E9*Data.Aerosols;
Data.Volume_Bin=discretize(Data.Volume,[500,900]); %first bin (0-500), second bin is (500-900)
  Data.BTemp_Bin = discretize(Data.B_Temp,[0,10]); %first bin (0-10), second bin (10-20)

figure
hAx=axes; hold on
  hL=splitapply(@plotrows,Data.Aerosols,Data.G_Temp, Data.Volume_Bin); 
  hold on
  hL=splitapply(@plotrows,Data.Aerosols,Data.G_Temp, Data.BTemp_Bin); 
hAx.XScale='log';
grid on
set(gca, 'YDir', 'reverse');

 xlabel('Aerosols concentration', 'Fontweight', 'bold')
 ylabel('GTemp', 'Fontweight', 'bold')
 legend({'Volume [500-900J/kg]','B_Temp [0-10]'},'Location','southeast')
 
%%%%%%%%%%%%%%%%%%%%% plotrows function %%%%%%%%%%%%5
 function hL=plotrows(x,y,varargin)
   xy=sortrows([x y]);
  hL=scatter(xy(:,1),xy(:,2),varargin{:},'filled');
end
 

What is causing this issue and how can I solve it? I'll be grateful for any help.

P.S. I have also attached the data.

Answer 1

[the cyclist]

If I have interpreted your code correctly, you have plotted the x-y data, just in different groups. Your figure actually has four distinct plots on it, because each call to splitapply plots two groups. But because it is the same x-y data, the points are mostly over-striking each other, so you don't see them. By adding a couple more entries to the legend, you can see this.

Data=readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1122740/Data11.xlsx', 'Sheet', 1, 'ReadVariableNames', true, 'VariableNamingRule','preserve');
Data.Aerosols=1E9*Data.Aerosols;
Data.Volume_Bin=discretize(Data.Volume,[500,900]); %first bin (0-500), second bin is (500-900)
  Data.BTemp_Bin = discretize(Data.B_Temp,[0,10]); %first bin (0-10), second bin (10-20)

figure
hAx=axes; hold on
  hL=splitapply(@plotrows,Data.Aerosols,Data.G_Temp, Data.Volume_Bin); 
  hold on
  hL=splitapply(@plotrows,Data.Aerosols,Data.G_Temp, Data.BTemp_Bin); 
hAx.XScale='log';
grid on
set(gca, 'YDir', 'reverse');

 xlabel('Aerosols concentration', 'Fontweight', 'bold')
 ylabel('GTemp', 'Fontweight', 'bold')
 legend({'Volume [500-900J/kg]','B_Temp [0-10]','L3','L4'},'Location','southeast')

 
%%%%%%%%%%%%%%%%%%%%% plotrows function %%%%%%%%%%%%5
 function hL=plotrows(x,y,varargin)
   xy=sortrows([x y]);
  hL=scatter(xy(:,1),xy(:,2),varargin{:},'filled');
end