R.utils (version 2.0.0)

withRepos: Evaluate an R expression with repositories set temporarily

Description

Evaluate an R expression with repositories set temporarily.

Usage

withRepos(expr, repos="[[mainstream]]", ..., envir=parent.frame())

Arguments

expr

The R expression to be evaluated.

repos

A character vector of repositories to use.

...

Additional arguments passed to useRepos().

envir

The environment in which the expression should be evaluated.

Value

• Returns the results of the expression evaluated.

See Also

Internally, eval() is used to evaluate the expression. See also options() and install.packages.

Examples

# Install from BioC related repositories only
  withRepos(install.packages("edgeR"), repos="[[BioC]]")

  # Install from CRAN or BioC related repositories only
  withRepos(install.packages("edgeR"), repos=c("CRAN", "[[BioC]]"))

  # Install from mainstream repositories only (same as previous)
  withRepos(install.packages("edgeR"), repos="[[mainstream]]")

  # Install from R-Forge and mainstream repositories only
  withRepos(install.packages("R.utils"), repos="[[R-Forge]]")