R packages: dplyr拾遗
2016-04-18 09:36
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dplyr是HW的数据处理的利器
dplyr的介绍dplyr
备忘:
dplyr的介绍dplyr
备忘:
distinct去重
distinct(select(flights, tailnum)) #> Source: local data frame [4,044 x 1] #> #> tailnum #> (chr) #> 1 N14228 #> 2 N24211 #> 3 N619AA #> 4 N804JB #> .. ...
sample_n; sample_frac抽样
sample_n(flights, 10) #> Source: local data frame [10 x 16] #> #> year month day dep_time dep_delay arr_time arr_delay carrier tailnum #> (int) (int) (int) (int) (dbl) (int) (dbl) (chr) (chr) #> 1 2013 6 12 1428 -7 1733 -17 DL N370NW #> 2 2013 3 23 600 -7 955 23 UA N510UA #> 3 2013 3 29 1814 14 1920 3 B6 N238JB #> 4 2013 2 25 1957 -10 2156 -10 EV N19966 #> .. ... ... ... ... ... ... ... ... ... #> Variables not shown: flight (int), origin (chr), dest (chr), air_time #> (dbl), distance (dbl), hour (dbl), minute (dbl) sample_frac(flights, 0.01) #> Source: local data frame [3,368 x 16] #> #> year month day dep_time dep_delay arr_time arr_delay carrier tailnum #> (int) (int) (int) (int) (dbl) (int) (dbl) (chr) (chr) #> 1 2013 5 7 1156 -4 1321 -17 UA N432UA #> 2 2013 4 18 1543 -5 1755 -25 DL N369NB #> 3 2013 3 26 1408 -7 1623 -8 DL N344NB #> 4 2013 1 24 2001 66 2211 71 MQ N526MQ #> .. ... ... ... ... ... ... ... ... ... #> Variables not shown: flight (int), origin (chr), dest (chr), air_time #> (dbl), distance (dbl), hour (dbl), minute (dbl)
top_n
排名前n的lag
实现diff类的功能tally
summarise(n())相关文章推荐
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