I believe this is documented behavior. The 'read.csv' function is a
front-end to 'read.table' with different default values. IN this
particular case, read.csv sets fill = TRUE, which means that it is
supposed to fill incomplete lines with NA's. It also sets header=TRUE,
which is presumably what it is using to determine the expected length of
a line-row.
-- Kevin
On 2/25/2021 4:11 AM, TAYLOR, Benjamin (BLACKPOOL TEACHING HOSPITALS NHS
FOUNDATION TRUST) via R-devel wrote:
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:
a,b,c,d,e,f,g
1,2,3,4
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:
a,b,c,d,e,f,g
1,2,3,4,,,
But the missing commas in the first example? Thoughts from others would be
welcome.
Kind regards
Ben
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Benjamin M. Taylor, MSci, MSc, PhD
Lead Data Scientist
Blackpool Teaching Hospitals NHS Foundation Trust
Home 15
Whinney Heys Road
Blackpool
FY3 8NR
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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