# compareVersion

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##### Compare Two Package Version Numbers

Compare two package version numbers to see which is later.

Keywords
utilities
##### Usage
compareVersion(a, b)
##### Arguments
a, b
Character strings representing package version numbers.
##### Details

R package version numbers are of the form x.y-z for integers x, y and z, with components after x optionally missing (in which case the version number is older than those with the components present).

##### Value

0 if the numbers are equal, -1 if b is later and 1 if a is later (analogous to the C function strcmp).

package_version, library, packageStatus.
library(utils) compareVersion("1.0", "1.0-1") compareVersion("7.2-0","7.1-12")