compareVersion {utils} | R Documentation |
Compare two package version numbers to see which is later.
compareVersion(a, b)
a, b |
Character strings representing package version numbers. |
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).
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
.
compareVersion("1.0", "1.0-1") compareVersion("7.2-0","7.1-12")