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113,061 skills indexed with the new KISS metadata standard.

Showing 24 of 113,061Categories: Writing & Content, Coding & Debugging, General
General
PromptBeginner5 minmarkdown

- `formatC(x

format = f

0
General
PromptBeginner5 minmarkdown

- Converts character vectors to appropriate types (logical

integer

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General
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- `which = both` (default)

`left`

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General
PromptBeginner5 minmarkdown

- `substring(x

first

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General
PromptBeginner5 minmarkdown

- Assignment form: `substr(x

1

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General
PromptBeginner5 minmarkdown

- Returns a **list** (one element per input string)

even for a single string.

3
General
PromptBeginner5 minmarkdown

- Common mistake: unnamed arguments silently match `fixed`

`perl`

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General
PromptBeginner5 minmarkdown

- Three regex modes: POSIX extended (default)

`perl = TRUE`

0
Writing & Content
PromptBeginner5 minmarkdown

- `write.csv` fixes `sep =

`

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General
PromptBeginner5 minmarkdown

- **Name arguments explicitly** — unnamed args after `x`/`pattern` are matched positionally to `ignore.case`

`perl`

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General
PromptBeginner5 minmarkdown

- `read.csv` defaults differ from `read.table`: `header = TRUE`

`sep =

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General
PromptBeginner5 minmarkdown

> Non-obvious behaviors

gotchas

2
General
PromptBeginner5 minmarkdown

- `sep = "` (default) means **any whitespace** (spaces

tabs

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General
PromptBeginner5 minmarkdown

- `file_test(-nt

f1

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General
PromptBeginner5 minmarkdown

- `file_test(-f

path)`: TRUE if regular file exists.

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General
PromptBeginner5 minmarkdown

- `file_test(-d

path)`: TRUE if directory exists.

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General
PromptBeginner5 minmarkdown

- On some filesystems

`ctime` is status-change time

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General
PromptBeginner5 minmarkdown

- `list.files(pattern = *.csv)` — `pattern` is a **regex**

not a glob! Use `glob2rx(*.csv)` or `\\.csv$`.

0
General
PromptBeginner5 minmarkdown

- `options(contrasts = c(contr.treatment

contr.poly))`: default contrasts for unordered/ordered factors.

0
General
PromptBeginner5 minmarkdown

- `options(OutDec =

)`: change decimal separator in output (affects `format`

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General
PromptBeginner5 minmarkdown

- `file.path(a

b

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General
PromptBeginner5 minmarkdown

- `options(digits = n)`: significant digits for printing (1-22

default 7). Suggestion only.

0
General
PromptBeginner5 minmarkdown

- `options(warn = n)`: -1 = ignore warnings

0 = collect (default)

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General
PromptBeginner5 minmarkdown

- `options(digits.secs = n)`: max decimal digits for seconds in time formatting (0-6

default 0).

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