如何将 R data.frame 保存为没有空格的 CSV？

Posted 2023-05-07

【中文标题】如何将 R data.frame 保存为没有空格的 CSV？

【英文标题】：How to save an R data.frame as CSV with no spaces?

【发布时间】：2020-10-21 19:44:38

【问题描述】：

我有以下data.frame 保存为CSV 文件。当data.frame 保存为CSV 时，我在Text 组件之后看到一个点空间（见图）。如何在将data.frame 保存为CSV 时避免空间创建？谢谢

library(lubridate)
library(tidyverse)

DF <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2001-12-31"), by = "days"), Flow = runif(365, 1, 5)) %>% 
      mutate(Year = year(Date), Month = month(Date), Day = day(Date), JDay = yday(Date), Text = rep("FLOW_OUT_",365)) %>% 
      mutate(Format = paste(Text,JDay,"_",Year)) %>% 
      select(8) %>% 
      write.csv(file = "Format.csv")

【参考方案1】：

我们可以使用paste0 代替paste 来避免创建空格，因为paste 中的默认sep 选项是sep= " "

...
  mutate(Format = paste0(Text,JDay,"_",Year))
...

-完整代码

DF <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2001-12-31"), 
         by = "days"), Flow = runif(365, 1, 5)) %>% 
      mutate(Year = year(Date), Month = month(Date),
      Day = day(Date), JDay = yday(Date), Text = rep("FLOW_OUT_",365)) %>% 
      mutate(Format = paste0(Text,JDay,"_",Year)) %>% 
      select(8)

---

或者另一种选择是在paste 中使用sep 参数

DF <- data.frame(Date = seq(as.Date("2001-01-01"), to = as.Date("2001-12-31"), 
             by = "days"), Flow = runif(365, 1, 5)) %>% 
          mutate(Year = year(Date), Month = month(Date),
          Day = day(Date), JDay = yday(Date), Text = rep("FLOW_OUT_",365)) %>% 
          mutate(Format = paste(Text,JDay,"_",Year, sep="")) %>% 
          select(8)

-输出

head(DF)
#           Format
#1 FLOW_OUT_1_2001
#2 FLOW_OUT_2_2001
#3 FLOW_OUT_3_2001
#4 FLOW_OUT_4_2001
#5 FLOW_OUT_5_2001
#6 FLOW_OUT_6_2001