AgentSkillify

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121,569 skills indexed with the new KISS metadata standard.

Showing 24 of 121,569Categories: Data & Insights, Coding & Debugging, General, Data
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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General
PromptBeginner5 minmarkdown

- `file.path(a

b

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General
PromptBeginner5 minmarkdown

- `options(contrasts = c(contr.treatment

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

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General
PromptBeginner5 minmarkdown

- `options(OutDec =

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

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General
PromptBeginner5 minmarkdown

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

0 = collect (default)

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General
PromptBeginner5 minmarkdown

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

default 7). Suggestion only.

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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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General
PromptBeginner5 minmarkdown

- `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 minmarkdown

- `system.time(expr)` returns `user`

`system`

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General
PromptBeginner5 minmarkdown

- Explicit units: `secs`

`mins`

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General
PromptBeginner5 minmarkdown

- `as.numeric(diff

units = hours)` to extract numeric value in specific units.

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General
PromptBeginner5 minmarkdown

- `difftime` arithmetic: subtracting POSIXct objects gives difftime. Units auto-selected (secs

mins

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General
PromptBeginner5 minmarkdown

- `POSIXlt`: list with components `$sec`

`$min`

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General
PromptBeginner5 minmarkdown

- `difftime(time1

time2

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