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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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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Data
PromptBeginner5 minmarkdownQuality: 24
- Returns data frame with size
isdir
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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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General
PromptBeginner5 minmarkdownQuality: 24
- `file.path(a
b
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General
PromptBeginner5 minmarkdownQuality: 24
- options(warn = n): -1 = ignore warnings
0 = collect (default)
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General
PromptBeginner5 minmarkdownQuality: 24
- `options(OutDec =
): change decimal separator in output (affects format`
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General
PromptBeginner5 minmarkdownQuality: 24
- options(digits.secs = n): max decimal digits for seconds in time formatting (0-6
default 0).
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General
PromptBeginner5 minmarkdownQuality: 24
- system.time(expr) returns user
system
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General
PromptBeginner5 minmarkdownQuality: 24
- options(digits = n): significant digits for printing (1-22
default 7). Suggestion only.
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General
PromptBeginner5 minmarkdownQuality: 28
- options(scipen = n): positive biases toward fixed notation
negative toward scientific. Default 0. Applies to print/format/cat but not sprintf.
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General
PromptBeginner5 minmarkdownQuality: 24
- `as.numeric(diff
units = hours)` to extract numeric value in specific units.
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General
PromptBeginner5 minmarkdownQuality: 24
- `difftime(time1
time2
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General
PromptBeginner5 minmarkdownQuality: 24
- Explicit units: secs
mins
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General
PromptBeginner5 minmarkdownQuality: 24
- POSIXct: seconds since 1970-01-01 UTC (compact
a numeric vector).
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General
PromptBeginner5 minmarkdownQuality: 28
- difftime arithmetic: subtracting POSIXct objects gives difftime. Units auto-selected (secs
mins
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