3  Read data

library(rtemis)

  .:rtemis 0.99.93 🌊 aarch64-apple-darwin20

rtemis’s read() function allows reading tabular data of various formats:

• Delimited files using data.table:fread(), arrow:read_delim_arrow(), vroom::vroom(), duckdb::duckdb_read_csv()
• ARFF files using farff::readARFF()
• Parquet files using arrow::read_parquet()
• XLSX files using readxl::read_excel()
• DTA files from Stata using haven::read_dta()
• FASTA files using seqinr::read.fasta()
• RDS files using readRDS()

3.1 Delimited files

Delimited files, particularly when large and containing complex data, can be slow and/or difficult to parse. read()’s delim_reader argument allows to specify which package to use for reading delimited files. Available options:

• data.table’s fread()
• arrow’s read_delim_arrow()
• vroom’s vroom()
• duckdb’s duckdb_read_csv()

We also await the CRAN release of polars, the R port of the performant data frame structure written in Rust.

sonar <- read("~/Data/iris.csv")

2025-06-04 08:22:39 ▶ Reading iris.csv using data.table... [read]
2025-06-04 08:22:39 Read in 149 x 5 [read]
2025-06-04 08:22:39 Done in 2.2e-04 minutes (Real: 0.01; User: 0.01; System: 1e-03). [read]