Question

r语言中图例legend的边框线如何去掉

Answer 1

参数bty：the type of box to be drawn around the legend. The allowed values are "o" (the default) and "n".
byt="n"是无框

Answer 2

bty
the type of box to be drawn around the legend. The allowed values are "o" (the default) and "n".
bty="n"是无框

Answer 3

引用似水年华1218的回答：
参数bty：the type of box to be drawn around the legend. The allowed values are "o" (the default) and "n".
byt="n"是无框

bty=“n”