% 分成3个语句，用 hold on
plot(x,y1,'k-x','LineWidth',2,'MarkerEdgeColor','k','MarkerFaceColor','k','MarkerSize',10);
hold on
plot(x,y2,'b-o','LineWidth',2,'MarkerEdgeColor','b','MarkerFaceColor','b','MarkerSize',10);
plot(x,y3,'g-^','LineWidth',2,'MarkerEdgeColor','g','MarkerFaceColor','g','MarkerSize',10);
hold off
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