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x=[26,5,8,10,13,17,20,25,31,35,36,41,45];
y=[31,33,9,24,34,23,10,47,18,42,25,31,38];
name=['A','1','2','3','4','5','6','7','8','9','10','11','12'];
x1=[13,5,10,17,26,36,41,45,35,25];
y1=[34,33,24,23,31,25,31,38,42,47];
plot(x1,y1);
hold on;
x2=[8,20,17];
y2=[9,10,23];
plot(x2,y2);
x3=[31,36];
y3=[18,25];
plot(x3,y3);
for i=1:13
text(x(i),y(i),name(i));
end
grid on;
运行结果: