There are many solutions for writing data from R to txt (i.e., tsv: tab-separated values) or csv (comma-separated values) files. In our previous articles, we described R base functions (write.table() and write.csv()) for writing data from R to txt|csv files R.
In this article, we’ll describe a most modern R package readr, developed by Hadley Wickham, for fast reading and writing delimited files. It contains the function write_delim(), write_csv() and write_tsv() to export easily a data from R.
Compared to R base functions (write.csv() and write.table()), readr functions:
- are much faster (X2),
- never write row names.
Launch RStudio as described here: Running RStudio and setting up your working directory
Installing and loading readr
# Installing install.packages("readr") # Loading library("readr")
readr functions for writing data
The function rwrite_delim()[in readr package] is a general function to export a data table from R. Depending on the format of your file, you can also use:
- write_csv(): to write a comma (“,”) separated values
- write_tsv(): to write a tab separated (“\t”) values
The simplified format of these functions are, as follow:
# General function write_delim(x, path, delim = " ") # Write comma (",") separated value files write_csv(file, path) # Write tab ("\t") separated value files write_tsv(file, path)
- x: a data frame to be written
- path: path to the result file
- delim: Delimiter used to separate values. Must be single character.
Writing data to a file
The R code below exports the built-in R mtcars data set to a tab-separated ( sep = “\t”) file called mtcars.txt in the current working directory:
# Loading mtcars data data("mtcars") library("readr") # Writing mtcars data to a tsv file write_tsv(mtcars, path = "mtcars.txt") # Writing mtcars data to a csv file write_csv(mtcars, path = "mtcars.csv")
Write data from R to a txt (i.e., tsv) file: write_tsv(my_data, path = “my_data.txt”)
- Write data from R to a csv file: write_csv(my_data, path = “my_data.csv”)
This analysis has been performed using R (ver. 3.2.3).
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