我正在尝试为 geom_point 大小添加一个条件,并且我在下面粘贴了我的示例。当 n_in_stat 为 4 或更大时,我希望 geom_point 的大小为 2,当 n_in_stat 小于 4 时,我希望 size = 5。我尝试在 geom_point 中放置一个 ifelse 语句,但这失败了。也许我不能在这里包含逻辑运算符,我必须在 data.frame 中创建一个新列并将大小设置为那个?
geom_point(size = ifelse(n_in_stat < 4, 5, 2)) + # 尝试使用 ifelse 设置大小
geom_point(aes(size = n_in_stat)) + # 原始线性缩放
library(ggplot2)
# Create a long data.frame to store data...
growth_series = data.frame ("read_day" = c(0, 3, 9, 0, 3, 9, 0, 2, 8),
"series_id" = c("p1s1", "p1s1", "p1s1", "p1s2", "p1s2", "p1s2", "p3s4", "p3s4", "p3s4"),
"mean_od" = c(0.6, 0.9, 1.3, 0.3, 0.6, 1.0, 0.2, 0.5, 1.2),
"sd_od" = c(0.1, 0.2, 0.2, 0.1, 0.1, 0.3, 0.04, 0.1, 0.3),
"n_in_stat" = c(8, 8, 8, 8, 7, 5, 8, 7, 2)
)
# Plot using ggplot...
ggplot(data = growth_series, aes(x = read_day, y = mean_od, group = series_id, color = series_id)) +
geom_line(size = 1.5) +
geom_point(aes(size = n_in_stat)) +
geom_errorbar(aes(ymin = mean_od - sd_od, ymax = mean_od + sd_od), size = 1, width = 0.3) +
xlab("Days") + ylab("Log (O.D. 730 nm)") +
scale_y_log2() +
scale_colour_hue('my legend', breaks = levels(growth_series$series_id), labels=c('t1', 't2', 't3'))