R readr

The readr package provides file I/O functions.

Contents

Installation

readr is commonly used through Tidyverse.

Data Format	Ingress Example	Outgress Example
Native R	`read_rds("data.rds")`	`write_rds(df, "data.rds")`
Comma-delimited	`read_csv("data.csv")`	`write_csv(df, "data.csv")`
Tab-delimited	`read_tsv("data.tsv")`	`write_tsv(df, "data.tsv")`
Any delimiter	`read_delim("data.txt", delim="\|")`	`write_delim(df, "data.txt", delim="\|")`
Fixed width	`read_fwf("data.txt", fwf_widths(c(2,2,NA)))`	N/A

These functions (aside from the native R ones) all take these arguments:

If col_names is a logical, it toggles whether the first row is read as a header.
If col_names is a vector, the variables are named accordingly.
skip causes the parser to skip some number of rows.
n_max causes the parser to stop after some number of rows.
guess_max is the number of rows to parse before determining the storage type. To parse all data before type casting, try guess_max = Inf.
col_select subsets the columns to store. It should be specified like col_select = c(1,2,3). Something like col_select = c(foo, bar, baz) can be used if there is header information.