topright多次運行出現兩層注釋怎么去掉
legend("topright",pch=1,col = c("red","blue","green"),legend = c("9","5","678"))，運行兩邊后，右上方出現了兩層注釋，再運行都去不掉了，怎么辦？
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legend("topright",pch=1,col = c("red","blue","green"),legend = c("9","5","678"))，運行兩邊后，右上方出現了兩層注釋，再運行都去不掉了，怎么辦？
2016-05-25
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2016-09-22
清空下plot，重新執行