这是我的一些数据：
df <- structure(list(farm = c("F1", "F1",
"F1", "F1"), index = structure(c(1L,
1L, 4L, 4L), .Label = c("HT", "Mid-T", "Outside Mid-T", "Outside South"
), class = "factor"), sensorheight = c(1L, 1L, 1L, 1L), yrmonth = structure(c(1491004800,
1496275200, 1491004800, 1496275200), class = c("POSIXct", "POSIXt"
), tzone = "UTC"), monthindex = structure(c(2L, 2L, 2L, 2L), .Label = c("Spring",
"Winter"), class = "factor"), N = c(2, 2, 1, 1), TempC = c(2.06446759259259,
6.68402777777778, 1.32268518518518, 5.63194444444445), sd = c(1.17081824208967,
0.034373246307681, NA, NA), se = c(0.827893518518518, 0.0243055555555567,
NA, NA), ci = c(10.5193845460483, 0.308831365115372, NA, NA)), .Names = c("farm",
"index", "sensorheight", "yrmonth", "monthindex", "N", "TempC",
"sd", "se", "ci"), row.names = c(7L, 9L, 20L, 22L), class = "data.frame")
我想在 x 轴上用自定义月份标签绘制它：
labels <- c('March*', 'April', 'May*', 'June', 'July')
当我添加标签时，它不会按正确的顺序放置标签：
ggplot(df, aes(x=yrmonth,y=TempC)) +
geom_line(size=.4) +
geom_point(size=1.5) +
scale_x_datetime(name = " ", date_breaks = "1 month", date_labels = labels) +
scale_y_continuous(name = "Monthly Average Maximum Temperature at 1 m (°C)")
您可以通过因子水平定义顺序
labels <- c("March*", "April", "May*", "June", "July")
labels <- factor(labels,levels=labels)
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