Ensuring long digits are maintained in CSV output

问题

I have an R data frame which needs to be saved as a csv file however one numeric column changes its format when saved as a csv file.

I have a character column named ID as below:

df <- data.frame(ID = as.character(1181050000000002, 1189050000000003),
                 Other = c("John", "Mary"))

When I save as a csv file on r, it changes to

write.csv(df, "df.csv", row.names = FALSE)

df <- read.csv("df.csv")

df$ID

ID
1181050000000000
1189050000000000

The output when I open the csv file should appear as original

ID
1181050000000002
1189050000000003

回答1:

Here's an approach that worked for me using readr:

library(readr)

write_csv(df, "df.csv")

options(scipen=999)

df1 <- read.csv("df.csv")

df1

#                ID
#1 1181050000000002
#2 1189050000000003

And here's a screen shot:

回答2:

Try library bit64

dt$ID <- as.integer64(dt$id)

It is a high precision integer. Usually works well with this long number issues (if all your id are combinations of digits, of course)

来源：https://stackoverflow.com/questions/54647922/ensuring-long-digits-are-maintained-in-csv-output