设置日期时间轴限制偏移值
我有一个由几个部分组成的情节（见下文）。为了简单起见，我举了一个例子。它从一天的08:00开始，到同一天的09:00结束。时区是UTC。
df <- data.frame(x = as.POSIXct("2016-02-05 08:00:00", tz = "UTC"),
xend = as.POSIXct("2016-02-05 09:00:00", tz = "UTC"),
y = 1)
基本情节按预期工作，分段为08至09：
library(ggplot2)
ggplot(data = df, aes(x = x, xend = xend, y = y, yend = y)) +
geom_segment(size = 3)
然而，当我添加xlim时，x值会偏移一个小时（+1），并且该段的运行时间为09到10，而不是08到09.但是这些限制会正确显示（07 -10）。
ggplot(data = df, aes(x = x, xend = xend, y = y, yend = y)) +
geom_segment(size = 3) +
xlim(as.POSIXct("2016-02-05 07:00:00"), as.POSIXct("2016-02-05 10:00:00"))
我想我对时区或如何设置轴限制有误解，但在查看了许多SO帖子和帮助页面后，我无法找到要点。我也尝试了scale_x_datetime()，但无法找到正确的设置。
如果有人有兴趣，请按照我的实际数据和相应的代码进行操作。正如您在数据的第一行中看到的那样，我的日期 - 时间列＆＃34; fecha＆＃34;从2016-02-05 08:07:00
datos.uvi1[1,]
# fecha.hora latitud longitud altitud cobertura_nubosa longitud_de_onda RGlobal RDirecta
# 201602050807 37.75 -1.25 300 0.62 284.55 10.29363 0.00736326
# RDifusa AnguloZenital blank fecha
# 1 10.28627 79.872 NA 2016-02-05 08:07:00
但是，在图中，第一个x值出现在09:00。
ggplot(data = DF1, aes(x = x1, y = y1, xend = x2, yend = y2, colour = col)) +
geom_segment(size = 1) + theme_bw() +
xlim(as.POSIXct("2016-02-05 06:00:00"), as.POSIXct("2016-02-05 18:00:00")) +
ylim(-100,500)
查找此处使用的数据
dput(DF1)
structure(list(x1 = structure(c(1454630400, 1454631300, 1454632200,
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1 个答案:
答案 0 :(得分：2)
问题在于您当地时间与您使用的UTC时间之间的差异，以及ggplot显示设置限制时的那些时间。
要解决此问题，您必须使用scale_x_datetime()并提供时区UTC限制，并在时区UTC添加参数time_trans()。
library(scales)
ggplot(data=DF1, aes(x=x1, y=y1, xend = x2, yend = y2, colour=col)) +
geom_segment(size = 1) + theme_bw() +
scale_x_datetime(limits=c(as.POSIXct("2016-02-05 06:00:00",tz="UTC"), as.POSIXct("2016-02-05 18:00:00",tz="UTC")),
date_breaks="1 hour",labels=date_format("%H:%M"),
time_trans(tz="UTC"))+
ylim(-100,500)
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