requireversion {spatstat.geom}

Require a Specific Version of a Package

Description

Checks that the version number of a specified package is greater than or equal to the specified version number. For use in stand-alone R scripts.

Usage

requireversion(pkg, ver, fatal=TRUE)

Arguments

pkg

Package name.

ver

Character string containing version number.

fatal

Logical value indicating whether an error should occur when the package version is less than ver.

Details

This function checks whether the installed version of the package pkg is greater than or equal to ver. By default, an error occurs if this condition is not met.

It is useful in stand-alone R scripts, which often require a particular version of a package in order to work correctly.

This function should not be used inside a package: for that purpose, the dependence on packages and versions should be specified in the package description file.

Value

A logical value.

Author(s)

Adrian Baddeley [e-mail]

Examples

  requireversion(spatstat.geom, "1.42-0")
  requireversion(spatstat.data, "999.999-999", fatal=FALSE)