topright多次运行出现两层注释怎么去掉
legend("topright",pch=1,col = c("red","blue","green"),legend = c("9","5","678"))，运行两边后，右上方出现了两层注释，再运行都去不掉了，怎么办？
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legend("topright",pch=1,col = c("red","blue","green"),legend = c("9","5","678"))，运行两边后，右上方出现了两层注释，再运行都去不掉了，怎么办？
2016-05-25
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