dbl>#> 2 B NaN NaN#> 4 D 5 5#> Error: Column `col2` must be length 4 (the number of rows) 浏览4提问于2019-11-15得票数1 回答已采纳 2回答 不同行中值之间的差异 、 我试图使用dplyr从同一组中的另一行的值中减去特定组中的值。,"6","7","10"), 我正试图将2001和20052 2001 15 ...
为什么?示例:df <- data_frame(id = rep(1:5, each = 42), name = rep(letters[1:7], each = 6, timesColumn `tp` must be length 210 (the number of rows) or one, not 42df$tp <- c(1:42) #works 我的变异代码是错的,还是循环 浏览6提问于2018-01-15得票数 10 回答已采纳...
keep rows matching criteria # base R approach to view all flights on January 1flights[flights$Month==1&flights$DayofMonth==1,]# dplyr approach# note: you can use comma or ampersand to represent AND conditionfilter(flights,Month==1,DayofMonth==1)# use pipe for OR conditionfilter(flights,...
原始答案如下:library(dplyr)set.seed(123)df <- data.frame( x = sample(0:1, 10, replace = T), y = sample(0:1, 10, replace = T), z = 1:10)一种方法是分组,然后仅保留第一行:df %>% group_by(x, y) %>% filter(row_number(z) == 1)## Source: local d...
filter()Filter (subset) rows.WHERE group_by()Group the dataGROUP BY summarise()Summarise (or aggregate) data- arrange()Sort the dataORDER BY join()Joining data frames (tables)JOIN mutate()Creating New VariablesCOLUMN ALIAS dplyr中主要方法的使用 ...
)# `reframe()` allows you to apply functions that return# an arbitrary number of rowsdf %>%reframe(x = intersect(x, table))#> # A tibble: 4 × 1#> x#> <chr>#> 1 a#> 2 b#> 3 f#> 4 d# Functions are applied per group, and each group can return a# different number of...
library(dplyr) # Extract rows that meet logical criteria filter(iris,Sepal.Length>7) # Remove duplicate rows distinct(iris) # Randomly select fraction of rows fraction(分数) sample_frac(iris,0.5,replace = TRUE) # Randomly select n rows sample_n(iris,10,replace = TRUE) #Select rows by ...
Youcaneithersupplyonedataframeperargument,oralistofdataframesin thefirstargument. Whencolumn-binding,rowsarematchedbyposition,notvaluesoalldata framesmusthavethesamenumberofrows.Tomatchbyvalue,notposition, seeleft_joinetc.Whenrow-binding,columnsarematchedbyname,andany valuesthatdon’tmatchwillbefilledwith...
## ..$ .rows:List of 3 ## .. ..$ : int [1:6] 1 2 3 4 5 6 ## .. ..$ : int [1:12] 7 8 9 10 11 12 13 14 15 16 ... ## .. ..$ : int [1:9] 19 20 21 22 23 24 25 26 27 ## ..- attr(*, ".drop")= logi TRUE ...
This is one of the major benefits of dplyr, and is now also available for those working with xdf files.Support for dplyr FunctionalitydplyrXdf supports all the major verbs provided with dplyr. To be precise, this includes:filter and select to choose rows and columns...