Legend Problem in Scatter Plotting

Question

Ritesh Chandra Tewari 2021-1-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/728543-legend-problem-in-scatter-plotting

评论： Star Strider 2021-1-27

[m,n] = size(y);
x1 = X(:,1);
x2 = X(:,2);
for j=1:1:n
    for i=1:1:m
        if y(i,j)==1
            scatter(x1(i,j), x2(i,j), 20, y(i,j),'k', '+');
        else
            scatter(x1(i,j), x2(i,j), 10, y(i,j),'y', 'filled');
        hold on;
        
        end
            
    end
    
end
legend("Admitted","Not Admitted");

X is a 300x2 matrix consisting random data and y is a 300x1 matrix consisting only 0 and 1. I want to plot a 2D scatter graph of x1 and x2. Based on the value of y i.e. 0 or 1 the marker of the plot will be changed. But both the legend showing the same marker. I dont want to use any other plotting function , rather want to stick to scatter. The plot is showing like:

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Answer 1

Star Strider 2021-1-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/728543-legend-problem-in-scatter-plotting#answer_607508

在 MATLAB Online 中打开

See if this does what you want:

[m,n] = size(y);
x1 = X(:,1);
x2 = X(:,2);
for j=1:1:n
    for i=1:1:m
        if y(i,j)==1
            hs1 = scatter(x1(i,j), x2(i,j), 20, y(i,j),'k', '+');
        else
            hs2 = scatter(x1(i,j), x2(i,j), 10, y(i,j),'y', 'filled');
        hold on;
        
        end
            
    end
    
end
legend([hs1(1),hs2(1)],"Admitted","Not Admitted");