compareVersion
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
).
See Also
Examples
library(utils)
# NOT RUN {
compareVersion("1.0", "1.0-1")
compareVersion("7.2-0","7.1-12")
# }
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