geom_line
下降到零。
df_Filtered <- data.frame(stringsAsFactors=FALSE,
Country = c("Germany", "Germany", "Germany", "UK", "UK", "UK", "Japan",
"Japan"),
Sales = c(2000L, 1500L, 2150L, 1200L, 1300L, 2000L, 500L, 750L),
Year = c(2000L, 2001L, 2002L, 2000L, 2001L, 2002L, 2000L, 2001L)
)
mysize <- 0.1
ggplot(df_Filtered, aes(x = Year, y = Sales, colour = Country, scale_y_continuous(breaks = 1), size=mysize)) + geom_line() +
labs(x = paste("Sales per country"), y = "Sales per country", title = NULL) +
scale_x_continuous(breaks = c(2000, 2001, 2002)) +
scale_size(range = c(1, 4), guide="none") +
theme(panel.background = element_blank())