Dplyr 命令的共同点: - 第一个参数始终是 data frame - 随后的参数通常使用变量名(不带引号)描述要对哪些列进行操作 - 输出始终是一个新的 data frame Dplyr 命令根据其作用对象分为四组:rows,columns,groups, ortables 4.2 行 (row) filter ()和arrange ()两个函数都只影响行,列保持不变。我们还将讨论d...
mutate(): Create new columns by preserving the existing variables tidyr The tidyr package complements dplyr perfectly. It boosts the power of dplyr for data manipulation and pre-processing. Below is the list of functions tidyr offers: gather(): The function “gathers” multiple columns from you...
R包基础实操—tidyverse包 R包基础实操—tidyverse包 核⼼软件包是g g p l o t2、d p l y r、t i d y r、r e a d r、p u r r r、t i b b l e、s t r i n g r和f o r c a t s，它 们提供了建模、转换和可视化数据的功能。其中，r e a d r包⽤于读取数据，t i d ...
Please note that the tidyr project is released with aContributor Code of Conduct. By contributing to this project, you agree to abide by its terms. Releases31 tidyr 1.3.1Latest Jan 24, 2024 + 30 releases Contributors133 + 119 contributors...
iteritems():按列遍历，将DataFrame的每一列迭代为(列名, Series)对，可以通过row[index]对元素进行访...
请使用sapply尝试以下代码
Please note that the tidyr project is released with aContributor Code of Conduct. By contributing to this project, you agree to abide by its terms. Releases31 tidyr 1.3.1Latest Jan 24, 2024 + 30 releases Contributors133 + 119 contributors ...
unite(): combines multiple columns into a single column 代码语言:javascript 复制 library(tidyr) library(dplyr) DF <- data.frame(Group=rep(1:3, each=4), Year=rep(2006:2009, times=3), Qtr.1 = rep(seq(14, 20, 2), 3), Qtr.2 = rep(seq(12, 18, 2), 3), Qtr.3 = rep(seq...
Here are a few “byte sized” posts on all things tidyverse to start with and watch out this space for more. dplyr groupby() and summarize(): Group By One or More Variables How to Compute Summary Statistics Across Multiple Columns in R ...
Powered By Note that mutate() can be used to create new columns but also modify existing columns in much the same way that a mutation may from a biological perspective. It's not exactly right but a nice way to provide context for verb choice. Now that you have your extra variable, yo...