設置日期時間軸限制偏移值

我有一個由多個段組成的圖（見下文）。爲了簡單起見，我給出了一個細分的例子。一天開始於08:00，當天09:00結束。時區是UTC。設置日期時間軸限制偏移值

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)

基本情節按預期工作，從08至09段：

library(ggplot2) 
ggplot(data = df, aes(x = x, xend = xend, y = y, yend = y)) + 
    geom_segment(size = 3)

然而，當我添加xlim，x值由一個小時的偏差（ +1），段的運行時間從09到10，而不是從08到09.雖然（07-10）的限制顯示正確。

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"))

我想我誤解有關時區或如何設置軸限制，但我找不到點，看着許多SO職位和幫助頁面之後。我也試過scale_x_datetime()，但找不到正確的設置。

如果有人有興趣，這裏跟隨我的真實數據和相應的代碼。正如你可以將數據的第一行中所看到的，我的日期時間列「出生日期」開始於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

然而，在第一x值出現在09:00的情節。這裏使用

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)

查找數據

dput(DF1) 
structure(list(x1 = structure(c(1454630400, 1454631300, 1454632200, 
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來源

2016-02-05 pacomet

我相信你的問題可能有事情做與本地時間你的機器上。如果您根據當地時間和UTC之間的差異（例如，如果UTC時間超過5小時，將最小和最大限制增加5小時）調整您的限制，那麼您應該獲得理想的結果。 – Wyldsoul

你是對的@Henrik，但在這種情況下，提供的數據框有12個觀察5個變量，DF1對5個變量保存3893個觀察。在這種情況下，少一些會更多地結束，更長的帖子。 – pacomet

是@Wyldsoul這是一個關於系統時間的問題，請看下面Henrik的答案。並感謝評論。 – pacomet

問題是在您的本地時間與您正在使用UTC時間之間的區別，並在途中ggplot顯示，當您設置限制的那些時間。

要解決此問題，您必須使用scale_x_datetime()，並在那裏爲UTC時區提供限制，並在UTC時區添加參數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)

來源

2016-02-05 13:37:46

謝謝@ didzis-elferts。它運行完美。 – pacomet

@Henrik你的代碼也給我偏移量，但如果你在答案中加入'date_breaks ='和'labels ='，它就可以工作。 –

謝謝。正準備再次給你寫信。如果我添加了'labels'，它也可以工作，也不需要'time_trans'。 'ggplot（data = df，aes（x = x，xend = xend，y = y，yend = y））+ geom_segment（size = 3）+ scale_x_datetime（limits = c（as.POSIXct（「2016-02 -05 13:00:00「，tz =」UTC「）， as.POSIXct（」2016-02-05 16:00:00「，tz =」UTC「））， labels = date_format（」％H ：％M「，tz =」UTC「））'。 – Henrik

設置日期時間軸限制偏移值

回答

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