General
PromptBeginner5 minmarkdownQuality: 24
- `format(x
digits
0
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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
0
General
PromptBeginner5 minmarkdownQuality: 24
- Returns a list (one element per input string)
even for a single string.
0
General
PromptBeginner5 minmarkdownQuality: 28
- Name arguments explicitly — unnamed args after x/pattern are matched positionally to ignore.case
perl
0
General
PromptBeginner5 minmarkdownQuality: 24
- read.csv defaults differ from read.table: header = TRUE
`sep =
0
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.
0
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.
0
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.
0
General
PromptBeginner5 minmarkdownQuality: 28
- list.files(pattern = *.csv) — pattern is a regex
not a glob! Use glob2rx(*.csv) or \\.csv$.
0
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)
0
General
PromptBeginner5 minmarkdownQuality: 24
- `options(OutDec =
): change decimal separator in output (affects format`
0
General
PromptBeginner5 minmarkdownQuality: 24
- options(digits.secs = n): max decimal digits for seconds in time formatting (0-6
default 0).
0
General
PromptBeginner5 minmarkdownQuality: 24
- system.time(expr) returns user
system
0
General
PromptBeginner5 minmarkdownQuality: 24
- options(digits = n): significant digits for printing (1-22
default 7). Suggestion only.
0
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.
0
General
PromptBeginner5 minmarkdownQuality: 24
- `as.numeric(diff
units = hours)` to extract numeric value in specific units.
0