[Rd] read.csv, worrying behaviour?

TAYLOR, Benjamin (BLACKPOOL TEACHING HOSPITALS NHS FOUNDATION TRUST) benj@m|n@t@y|or3 @end|ng |rom nh@@net
Thu Feb 25 10:11:55 CET 2021

Dear all

I've been using R for around 16 years now and I've only just become aware of a behaviour of read.csv that I find worrying which is why I'm contacting this list. A simplified example of the behaviour is as follows

I created a "test.csv" file containing the following lines:


And then read it into R using:

> d = read.csv("test.csv")
> d
  a b c d  e  f  g
1 1 2 3 4 NA NA NA

I was surprised that this did not issue a warning. I can understand why the following csv would not issue a warning:


But the missing commas in the first example? Thoughts from others would be welcome.

Kind regards



Benjamin M. Taylor, MSci, MSc, PhD
Lead Data Scientist
Blackpool Teaching Hospitals NHS Foundation Trust
Home 15
Whinney Heys Road

Scholar: https://scholar.google.co.uk/citations?user=6Hf0CJkAAAAJ&hl=en
Github: https://github.com/bentaylor1
Gitlab: https://gitlab.com/ben_taylor
ORCID: http://orcid.org/0000-0001-8667-4089


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