但由于我需要将因子转换为字符，然后再转换回因子，因此丢失了一些重要信息。
因为我在这个项目中非常依赖dplyr，所以我想用dplyr实现这一点。iterrows(): 按行遍历，将DataFrame的每...
假设数据框为dat，列为var：case_when的语法是condition ~ value to replace。文档here。可能比使用repla...
假设数据框为dat，列为var：case_when的语法是condition ~ value to replace。文档here。可能比使用repla...
当index为0时为0s，如果不是，则为上面的值，但它不会replace值。
data.table内部优化形式的表达式DT[col == value]或DT[col %in% values] ,它使用二进制搜索 ,同时使用相同的基础 R 语法速度通过自动索引。 有关更多详细信息和微小基准, 请参见此处。 dplyr提供的功能标准评估版本(例如regroup, summarize_each_),可以简化程序中使用的dplyr (注意程序中使用的dat...
I was getting a weird error inside the mutate(across(...)) (see reprex), and by closely reading the stack trace I eventually realized it was because some function (presumably dplyr::across) is rewriting my function, changing the x in des...
library(dplyr) mtcars %>% # convert cyl column as.character mutate_at("cyl",as.character) %>% # add a copy of the origina data with cyl column = 'TOTAL' bind_rows(mutate(mtcars, cyl="total")) %>% group_by(cyl) %>% summarise_all(sum) 0投票 由于 summarize()解压数据框参数,例...
tbl_df automatically generates column names (#1606).tbl_cubenew as_data_frame.tbl_cube() (#1563, @krlmlr). tbl_cubes are now constructed correctly from data frames, duplicate dimension values are detected, missing dimension values are filled with NA. The construction from data frames now gues...
Data Manipulation in R With dplyr Package. Grouping Pipe Operator Sample() It is used to generate a sample of a specific size from a vector or a dataset, either with or without replacement. The basic syntax of sample() function is as follows: sample(data, size, replace = FALSE, prob =...