1. ggsave
例:
ggsave("OsatCopia.png", width=10, height=10, dpi=300)
注:ggsave只能保存ggplot2画的图。
2.设置透明底图
p2<-p1+labs(x="length of miRNA", y="number of miRNA")+ggtitle("p84k-A")+
theme(
panel.background = element_rect(fill = "transparent",colour = NA),
panel.grid.minor = element_blank(),
panel.grid.major = element_blank(),
plot.background = element_rect(fill = "transparent",colour = NA))








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