svMisc (version 0.9-68)

pkg: A very silent and multipackage require() function

Description

This function loads one or several R packages as silently as possible and it returns TRUE only if all packages are loaded successfully. If at least one loading fails, a short message is printed.

Usage

pkg(..., warn = TRUE)

Arguments

...

the name of one or several R packages to load (character strings).

warn

If TRUE, issue a warning if one or several packages are not loaded.

Value

• TRUE if all packages are loaded correctly, FALSE otherwise. This function is designed to concisely and quitely indicate package requirements in GUI menu or other GUI actions.

concept

package requirement and loading

See Also

require, pkgManLoad

Examples

## This should work...
if (all(pkg("tools", "methods"))) cat("Fine!
")
## ... but this not
if (!all(pkg("tools", "badname", warn = FALSE))) cat("Not fine!
")