Extract entries from a BibEntry object by index

Operator for extracting BibEntry objects by index.

Usage

# S3 method for class 'BibEntry'
x[[i, drop = FALSE]]

Arguments

x

a BibEntry object

i

numeric indices of entries to extract, or a character vector of keys corresponding to the entries to be extracted.

drop

logical, should attributes besides class be dropped from result?

Value

an object of class BibEntry.

Note

This method is different than the usual operator [[ for lists in that a vector of indices may be specified.

This method behaves differently than the [ operator for BibEntry objects in that it does not expand crossreferences when returning, so that a parent entry or xdata entry will be dropped if it is not also indexed when indexing the child entry.

This method is not affected by the value of BibOptions()$return.ind.

See also

Other operators: $.BibEntry(), $<-.BibEntry(), +.BibEntry(), [.BibEntry(), [<-.BibEntry(), [[<-.BibEntry(), c.BibEntry()

Examples

if (requireNamespace("bibtex")) {
    file.name <- system.file("Bib", "biblatexExamples.bib", package="RefManageR")
    bib <- suppressMessages(ReadBib(file.name))
    bib[[20:21]]
    bib[c("hyman", "loh")]

    ## Note this is FALSE because [[ does not inherit from the dropped parent entry while [ does.
    identical(bib[1], bib[[1]])
}
#> [1] FALSE