fread header = "auto" works strange
Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 35/100
Research direction
Start by reproducing the examples through fread with header = "auto", focusing on partially empty headers and character-only columns. Trace the header-detection entry point and existing tests for fread; done means the demonstrated inputs produce consistent, intended column names without changing the valid four-column case.
Written by the indexing model from the issue text.
Description
It works strange for partially empty headers and only character columns.
fread("col1;col2;col3;col4;;;;;;;
aaaa;bbbb;cccc;dddd;;;;;;;")
# V1 V2 V3 V4 V5 V6 V7 V8 V9 V10 V11
# 1: col1 col2 col3 col4 NA NA NA NA NA NA NA
# 2: aaaa bbbb cccc dddd NA NA NA NA NA NA NA
fread("col1;col2;col3;col4
aaaa;bbbb;cccc;dddd")
# col1 col2 col3 col4
# 1: aaaa bbbb cccc dddd
fread("col1;col2;col3;col4;;;;;;;
aaaa;2;cccc;dddd;;;;;;;")
# col1 col2 col3 col4 V5 V6 V7 V8 V9 V10 V11
# 1: aaaa 2 cccc dddd NA NA NA NA NA NA NA
Error is reproduced from 1.11.0
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
Matrix products: default
locale:
[1] LC_COLLATE=Russian_Russia.1251 LC_CTYPE=Russian_Russia.1251 LC_MONETARY=Russian_Russia.1251 LC_NUMERIC=C LC_TIME=Russian_Russia.1251
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] data.table_1.12.0 devtools_1.13.4
loaded via a namespace (and not attached):
[1] compiler_3.4.3 tools_3.4.3 withr_2.1.1 yaml_2.1.16 memoise_1.1.0 digest_0.6.14 ```
- Dominant language
- R
- Stars
- 3.9k
- Forks
- 1.1k
- Avg merge
- 14h 4m
- Merged PRs (30d)
- 4
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
More from Rdatatable/data.table
-
as.data.table() recurses without end on a survival::Surv object (or any data.frame carrying one) Open
Difficulty 2/5 1-3 hours Newbie friendliness 88/100
Rdatatable/data.table#7887 ·
-
consistency tests
Difficulty 2/5 1-3 hours Newbie friendliness 68/100
Rdatatable/data.table#7853 · 3 comments ·
-
internals
Difficulty 2/5 1-3 hours Newbie friendliness 65/100
Rdatatable/data.table#6938 · 1 comment ·
-
encoding fread
Difficulty 2/5 1-3 hours Newbie friendliness 65/100
Rdatatable/data.table#5179 · 8 comments ·
-
documentation programming
Difficulty 2/5 1-3 hours Newbie friendliness 68/100
Rdatatable/data.table#3199 · 3 comments ·
All issues in Rdatatable/data.table
Similar issues
-
Difficulty 2/5 1-3 hours Newbie friendliness 82/100
r-lib/pkgdepends#485 · 3 comments ·
-
Difficulty 1/5 Under an hour Newbie friendliness 92/100
-
beginners blocker
Difficulty 2/5 1-3 hours Newbie friendliness 78/100
-
enviPathR OpenBuild Error Build OK Build Warning policies-accepted pre-review precheck-passed
Difficulty 1/5 Under an hour Newbie friendliness 84/100
Bioconductor/BiocContributions#207 · 6 comments ·
-
Difficulty 2/5 1-3 hours Newbie friendliness 74/100
datacarpentry/semester-biology#1255 ·