最后,我们使用mutate函数将计算结果添加到数据框中。 使用lag函数: 代码语言:txt 复制 library(dplyr) # 定义要引用的变量名 column_name <- "column1" # 使用!!符号引用变量名 result <- df %>% mutate(lag_value = lag(!!sym(column_name))) # 输出结果 print(result) 在上面的示例中,我们使用了...
以下代码重命名数据集中的第一列: require(dplyr) mtcars %>% setNames(c("RenamedColumn", names(.)[2:length(names(.))])) 预期结果: RenamedColumn cyl disp hp drat wt qsec vs am gear carb Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 Mazda R 浏览7提问于2017-03-13得票...
处理列名特殊的情况,我看的不是很懂: # If you have column names that don't work as attributes, you can use an # alternate "get item" notation with X. diamonds["column w/ spaces"] = range(len(diamonds)) diamonds >> select(X["column w/ spaces"]) >> head() 转置: # It's possible...
The mydf delay data frame only has airline information by code. I’d like to add a column with the airline names from mylookup. One base R way to do this is with the merge() function, using the basic syntax merge(df1, df2). The order of data frame 1 and data frame 2 doesn't ...
# Student names name = c('Dan', 'Joann', 'Pedro', 'Rosie', 'Ethan', 'Vicky', 'Frederic', 'Jimmie', 'Rhonda', 'Giovanni', 'Francesca', 'Rajab', 'Naiyana', 'Kian', 'Jenny', 'Jakeem','Helena','Ismat','Anila','Skye','Daniel', 'Aisha'), # Study hours study_hours =...
num_range("x", 1:5, width = 2) # column/variable from x01 to x05 one_of("x", "y", "z") # column/variable contains in x, y, z everything() # all column/variable # e.g. order_tbl, check column names(order_tbl)
Example 3: Convert Row Names to Column with data.table Package Video, Further Resources & Summary Here’s how to do it… Creation of Example Data We’ll use the followingdata frame in Ras basement for this R programming tutorial: data<-data.frame(x1=LETTERS[1:5],# Create example datax...
3.Nevermungescolumnnames. 4.Onlyrecycleslength1inputs. 5.Evaluatesitsargumentslazilyandinorder. 6.Addstbl_dfclasstooutput. Usage data_frame(...) data_frame_(columns) Arguments ...Asetofnamedarguments columnsAlazy_dots. SeeAlso as_data_frametoturnanexistinglistintoadataframe. Examples a-1:5 ...
1. 向量操作 A. creat a vector B. Get values C. assign names to the vector elements D. get a...
如何合并数据在R使用R合并，dplyr，或data.table R有许多通过公共列连接数据帧的快速、优雅的方法。我想向你们展示其中的三个:1. 基数R的merge()函数2. Dplyr的join函数族3. 数据。表的括号语法一、获取并导入数据在这个例子中，我将使用我最喜欢的演示数据集之一——来自美国交通统计局的航班延误时间。如果您想...