General
PromptBeginner5 minmarkdownQuality: 24
- Captures output from cat
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Showing 24 of 128,460Categories: Coding & Debugging, General, Writing & Content
General
PromptBeginner5 minmarkdownQuality: 24
Non-obvious behaviors
gotchas
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Coding & Debugging
PromptBeginner5 minmarkdownQuality: 24
- `URLencode(url
reserved = FALSE) by default does NOT encode reserved chars (/`
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General
PromptBeginner5 minmarkdownQuality: 24
- Converts character vectors to appropriate types (logical
integer
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General
PromptBeginner5 minmarkdownQuality: 24
- as.is = TRUE (recommended): keeps characters as character
not factor.
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General
PromptBeginner5 minmarkdownQuality: 24
- `formatC(x
format = f
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General
PromptBeginner5 minmarkdownQuality: 24
- Assignment form: `substr(x
1
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General
PromptBeginner5 minmarkdownQuality: 24
- `format(x
digits
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General
PromptBeginner5 minmarkdownQuality: 24
- which = both (default)
left
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General
PromptBeginner5 minmarkdownQuality: 24
- `substring(x
first
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General
PromptBeginner5 minmarkdownQuality: 24
- Common mistake: unnamed arguments silently match fixed
perl
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General
PromptBeginner5 minmarkdownQuality: 24
- Three regex modes: POSIX extended (default)
perl = TRUE
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General
PromptBeginner5 minmarkdownQuality: 24
- Returns a list (one element per input string)
even for a single string.
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General
PromptBeginner5 minmarkdownQuality: 28
- Name arguments explicitly — unnamed args after x/pattern are matched positionally to ignore.case
perl
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General
PromptBeginner5 minmarkdownQuality: 24
- read.csv defaults differ from read.table: header = TRUE
`sep =
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Writing & Content
PromptBeginner5 minmarkdownQuality: 24
- write.csv fixes `sep =
`
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General
PromptBeginner5 minmarkdownQuality: 24
- sep = " (default) means any whitespace (spaces
tabs
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General
PromptBeginner5 minmarkdownQuality: 24
Non-obvious behaviors
gotchas
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General
PromptBeginner5 minmarkdownQuality: 24
- `file_test(-d
path)`: TRUE if directory exists.
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General
PromptBeginner5 minmarkdownQuality: 24
- `file_test(-nt
f1
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General
PromptBeginner5 minmarkdownQuality: 24
- `file_test(-f
path)`: TRUE if regular file exists.
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General
PromptBeginner5 minmarkdownQuality: 24
- On some filesystems
ctime is status-change time
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General
PromptBeginner5 minmarkdownQuality: 28
- `options(contrasts = c(contr.treatment
contr.poly))`: default contrasts for unordered/ordered factors.
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General
PromptBeginner5 minmarkdownQuality: 28
- list.files(pattern = *.csv) — pattern is a regex
not a glob! Use glob2rx(*.csv) or \\.csv$.
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