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122,416 skills indexed with the new KISS metadata standard.

Showing 24 of 122,416Categories: Research & Learning, General, Coding & Debugging, Data
General
PromptBeginner5 minmarkdown

> Non-obvious behaviors

gotchas

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General
PromptBeginner5 minmarkdown

- `I()` is required to use arithmetic operators literally: `y ~ x + I(x^2)`. Without `I()`

`^` means interaction crossing.

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Coding & Debugging
PromptBeginner5 minmarkdown

- `URLencode(url

reserved = FALSE)` by default does NOT encode reserved chars (`/`

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General
PromptBeginner5 minmarkdown

- Captures output from `cat`

`print`

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General
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- `as.is = TRUE` (recommended): keeps characters as character

not factor.

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General
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- Converts character vectors to appropriate types (logical

integer

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General
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- `formatC(x

format = f

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General
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- `which = both` (default)

`left`

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General
PromptBeginner5 minmarkdown

- `format(x

digits

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General
PromptBeginner5 minmarkdown

- Assignment form: `substr(x

1

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General
PromptBeginner5 minmarkdown

- `substring(x

first

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General
PromptBeginner5 minmarkdown

- Common mistake: unnamed arguments silently match `fixed`

`perl`

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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

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

even for a single string.

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General
PromptBeginner5 minmarkdown

- Three regex modes: POSIX extended (default)

`perl = TRUE`

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General
PromptBeginner5 minmarkdown

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

`sep =

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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

> Non-obvious behaviors

gotchas

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General
PromptBeginner5 minmarkdown

- `file_test(-d

path)`: TRUE if directory exists.

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General
PromptBeginner5 minmarkdown

- `file_test(-f

path)`: TRUE if regular file exists.

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General
PromptBeginner5 minmarkdown

- On some filesystems

`ctime` is status-change time

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Data
PromptBeginner5 minmarkdown

- Returns data frame with `size`

`isdir`

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General
PromptBeginner5 minmarkdown

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

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

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