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[英]How to customize and add discrete time steps to x-axis in time series plot in ggplot2 in R?
[英]R: Change x-axis of a time series analysis with ggplot2
我有几年的数据,想 plot 年内的变化。 从 1 月到 12 月的全年图表运行良好。 现在我只想关注几个月(7 月到 12 月)。 如何更改 x 轴? 由于 x 轴的格式为“日期”,我无法弄清楚它是如何工作的。 我已经尝试过“scale_x_datetime”和“scale_x_continuous”,但总是出错。
我的数据如下所示(示例):
values Date
3108013109920 2016-12-25
3108434522236 2016-08-03
5426634673322 2017-01-07
6133906789675 2018-11-27
3679575645687 2018-04-08
3363868796745 2019-05-23
到目前为止,这是我的代码:
cbPalette <- c("#000000", "#ff9208", "#2adfff", "#00d202", "#ffec16", "#f40300", "#384aff", "#8f0066")
p <- df %>%
# make datetime: force unique year
mutate(datetime = lubridate::make_datetime(2017, month, day)) %>%
ggplot() +
geom_line(aes(x = datetime, y = values, color = factor(year)), lwd = 1) +
scale_x_datetime(breaks = lubridate::make_datetime(2017,1:12), labels = month.abb) +
scale_colour_manual(values=cbPalette) +
labs(colour = "Year", x = "Date", y = "Number of water pixels") +
theme_bw() +
theme(axis.text=element_text(size=12),
axis.title=element_text(size=15)) +
theme(axis.title.x = element_text(vjust=-0.8),
axis.title.y = element_text(vjust=3),
axis.text.y = element_text(angle = 90, vjust = 1.5, hjust = 0.5)) +
theme(legend.title = element_text(size=15),
legend.text = element_text(size=12))
p
代码创建了这个 plot,我想放大红色矩形。
我们可以使用您的绘图代码创建带有一些虚构数据(见下文)的 plot:
p <- df %>%
mutate(datetime = make_datetime(2017, month, day)) %>%
ggplot() +
geom_line(aes(x = datetime, y = values, color = factor(year)), lwd = 1) +
scale_colour_manual(values = cbPalette) +
labs(colour = "Year", x = "Date", y = "Number of water pixels") +
theme_bw() +
theme(axis.text = element_text(size = 12),
axis.title = element_text(size = 15),
axis.title.x = element_text(vjust = -0.8),
axis.title.y = element_text(vjust =3 ),
axis.text.y = element_text(angle = 90, vjust = 1.5, hjust = 0.5),
legend.title = element_text(size = 15),
legend.text = element_text(size =12))
使用您的scale_x_datetime
,我们可以看到这类似于您自己的 plot:
p + scale_x_datetime(breaks = make_datetime(2017,1:12), labels = month.abb)
要放大,我们需要为此比例添加limits
:
p + scale_x_datetime(breaks = make_datetime(2017,1:12),
labels = month.abb,
limits = make_datetime(2017, c(7, 12)))
使用reprex v2.0.2创建于 2022-09-04
使用的数据
library(tidyverse)
library(lubridate)
set.seed(1)
df <- data.frame(date = seq(as.Date("2015-01-01"), by = "15 day", length = 195),
values = rpois(195, 2) * runif(195, 10000, 180000)) %>%
mutate(day = day(date), year = year(date), month = month(date))
cbPalette <- c("#000000", "#ff9208", "#2adfff", "#00d202", "#ffec16",
"#f40300", "#384aff", "#8f0066")
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