The 'plotData' command does not plot the complete set of binary data

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Manyu Hati
Manyu Hati 2021-8-29
回答： Star Strider 2021-8-29
Dear Matlabers,
I am trying to plot binary data by using the command called 'plotdata'. In the plot the '+' symbols represent the cases with y==1 and the yellow 'o' symbols represent the cases with y==0. If you open the excel file 'Testset1.xlsx', you can see that there are 16 test samples, and the command only plots 9 of them.
Could you help me to fix this issue, in order for the command to plot the complete 16 samples?
Below I paste the 5 lines of code and the excel file:
data=xlsread('Testset1','Final');
X = data(:, [1, 2, 3, 4]);
y = data(:, 5);
data_X=[X(:,3),X(:,4)];
plotData(data_X, y);
Many thanks,
MH

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回答（1 个）

Star Strider
Star Strider 2021-8-29
Ran in:
As ‘Udata4’ demonstrates, there are only 9 unique values.
So all the points are plotted, however only 9 of them are different. The 7 that are the same are overplotted on top of each other.
format short g
data = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/724374/Testset1.xlsx')
data = 16×5
0.21 30000 2.34 6.69 0 0.21 30000 2.34 7.11 0 0.21 30000 2.34 7.53 1 0.21 30000 2.34 7.95 1 0.21 30000 2.34 8.37 1 0.21 30000 2.34 8.78 1 0.21 30000 2.34 9.2 1 0.21 30000 2.34 9.6 1 0.21 30000 2.34 10 1 0.205 30000 2.34 6.69 0
Lv = data(:,5) == 1;
figure
plot(data(Lv,3), data(Lv,4), '+r')
hold on
plot(data(~Lv,3), data(~Lv,4), 'ob')
hold off
grid
Udata4 = unique(data(:,4),'stable')
Udata4 = 9×1
6.69 7.11 7.53 7.95 8.37 8.78 9.2 9.6 10
.

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