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我有一些不均勻間隔的天氣數據,我想抓住簡單的小時值。我需要計時,所以我可以加入這個數據了一個獨立的data.frame氣象數據的將不均勻間隔的時間數據更改爲均勻分佈的小時R
例子:
> weather_df
A tibble: 10 × 3
datetime temperature temperature_dewpoint
<dttm> <dbl> <dbl>
1 2011-01-01 00:00:00 4 -1
2 2011-01-01 00:20:00 3 -1
3 2011-01-01 00:40:00 3 -1
4 2011-01-01 01:00:00 2 -1
5 2011-01-01 01:20:00 2 0
6 2011-01-01 01:45:00 2 0
7 2011-01-01 02:05:00 1 -1
8 2011-01-01 02:25:00 2 0
9 2011-01-01 02:45:00 2 -1
10 2011-01-01 03:10:00 2 0
我想只有每小時的數據,但你可以看到觀察別t總是落在小時標記上。我嘗試了四捨五入,但隨後我有多次觀察。
weather_df$datetime_rounded <- as.POSIXct(round(weather_df$datetime, units = c("hours")))
weather_df
# A tibble: 10 × 4
datetime temperature temperature_dewpoint datetime_rounded
<dttm> <dbl> <dbl> <dttm>
1 2011-01-01 00:00:00 4 -1 2011-01-01 00:00:00
2 2011-01-01 00:20:00 3 -1 2011-01-01 00:00:00
3 2011-01-01 00:40:00 3 -1 2011-01-01 01:00:00
4 2011-01-01 01:00:00 2 -1 2011-01-01 01:00:00
5 2011-01-01 01:20:00 2 0 2011-01-01 01:00:00
6 2011-01-01 01:45:00 2 0 2011-01-01 02:00:00
7 2011-01-01 02:05:00 1 -1 2011-01-01 02:00:00
8 2011-01-01 02:25:00 2 0 2011-01-01 02:00:00
9 2011-01-01 02:45:00 2 -1 2011-01-01 03:00:00
10 2011-01-01 03:10:00 2 0 2011-01-01 03:00:00
我不能容易地確定要保留的觀測不脫離計算的datetime
的差。必須有一個更優雅的方式來做到這一點。任何幫助,將不勝感激!