sQuote {base} | R Documentation

## Quote Text

### Description

Single or double quote text by combining with appropriate single or double left and right quotation marks.

### Usage

    sQuote(x)
    dQuote(x)

### Arguments

`x` | an R object, to be coerced to a character vector.

### Details

The purpose of the functions is to provide a simple means of markup for quoting text to be used in the R output, e.g., in warnings or error messages.

The choice of the appropriate quotation marks depends on both the locale and the available character sets. Older Unix/X11 fonts displayed the grave accent (0x60) and the apostrophe (0x27) in a way that they could also be used as matching open and close single quotation marks. Using modern fonts, or non-Unix systems, these characters no longer produce matching glyphs. Unicode provides left and right single quotation mark characters (U+2018 and U+2019); if Unicode cannot be assumed, it seems reasonable to use the apostrophe as an undirectional single quotation mark.

Similarly, Unicode has left and right double quotation mark characters (U+201C and U+201D); if only ASCII's typewriter characteristics can be employed, than the ASCII quotation mark (0x22) should be used as both the left and right double quotation mark.

`sQuote` and `dQuote` currently only provide undirectional ASCII quotation style, but may be enhanced in the future.

### References

Markus Kuhn, “ASCII and Unicode quotation marks”. http://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html

### Examples

    paste("argument", sQuote("x"), "must be non-zero")

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