compareVersion
Compare Two Package Version Numbers
Description
Compares two package version numbers to see which one is more recent.
Usage
compareVersion(a, b)
Arguments
| a |
a character string containing the first version
number to compare.
|
| b |
a character string containing the second version
number to compare.
|
Details
A version number string contains a sequence of non-negative
integers separated by periods or hyphens, such as 1.2
or 1.2-17.
compareVersion(a,b) compares those integers lexicographically.
Value
- returns 0 if two version numbers are equal.
- returns -1 if b is more recent.
- returns 1 if a is more recent.
See Also
Examples
compareVersion("2.0", "2.0-1") # Returns -1
compareVersion("2.0-5", "3.0") # Returns -1
compareVersion("5.1-0","5.0-12") # Returns 1
compareVersion("3.1-12","3.1-12") # Returns 0
compareVersion("2.0", NA) # Returns 1
compareVersion(NA, "2.0-1") # Returns -1