vignette {utils} | R Documentation

## View, List or Get R Source of Package Vignettes

### Description

View a specified package vignette, or list the available ones; display it rendered in a viewer, and get or edit its R source file.

### Usage

    vignette(topic, package = NULL, lib.loc = NULL, all = TRUE)

    ## S3 method for class 'vignette'
    print(x, ...)
    ## S3 method for class 'vignette'
    edit(name, ...)

### Arguments

`topic` | a character string giving the (base) name of the vignette to view. If omitted, all vignettes from all installed packages are listed.
`package` | a character vector with the names of packages to search through, or `NULL` in which ‘all’ packages (as defined by argument `all`) are searched.
`lib.loc` | a character vector of directory names of R libraries, or `NULL`. The default value of `NULL` corresponds to all libraries currently known.
`all` | logical; if `TRUE` search all available packages in the library trees specified by `lib.loc`, and if `FALSE`, search only attached packages.
`x, name` | object of class `vignette`.
`...` | ignored by the `print` method, passed on to `file.edit` by the `edit` method.

### Details

Function `vignette` returns an object of the same class, the print method opens a viewer for it.

On Unix-alikes, The program specified by the `pdfviewer` option is used for viewing PDF versions of vignettes.

If several vignettes have PDF/HTML versions with base name identical to `topic`, the first one found is used.

If no topics are given, all available vignettes are listed. The corresponding information is returned in an object of class `"packageIQR"`.

### See Also

`browseVignettes` for an HTML-based vignette browser; `RShowDoc(<basename>, package = "<pkg>")` displays a “rendered” vignette (pdf or html).

### Examples

    ## List vignettes from all *attached* packages
    vignette(all = FALSE)

    ## List vignettes from all *installed* packages (can take a long time!):
    vignette(all = TRUE)

    ## The grid intro vignette -- open it
    ## Not run: vignette("grid") # calling print()
    ## The same (conditional on existence of the vignettte).
    ## Note that 'package = *' is much faster in the case of many installed packages:
    if(!is.null(v1 <- vignette("grid", package="grid"))) {
    ## Not run: v1 # calling print(.)
      str(v1)
      ## Now let us have a closer look at the code

    ## Not run: edit(v1) # e.g., to send lines ...
    }# if( has vignette "installed")
    ## A package can have more than one vignette (package grid has several):
    vignette(package = "grid")
    if(interactive()) {
       ## vignette("rotated")
       ## The same, but without searching for it:
       vignette("rotated", package = "grid")
    }

[Package utils version 3.6.1 Index]