Compare Two Package Version Numbers
Compare two package version numbers to see which is later.
- a, b
- Character strings representing package version numbers.
R package version numbers are of the form
x.y-z for integers
z, with components after
optionally missing (in which case the version number is older than
those with the components present).
0if the numbers are equal,
bis later and
ais later (analogous to the C function
compareVersion("1.0", "1.0-1") compareVersion("7.2-0","7.1-12")