head | R Documentation |
Head and tail operations on manifests
head(x, ...) ## S4 method for signature 'SessionManifest' head(x, n = 5, ...) ## S4 method for signature 'PkgManifest' head(x, n = 5, ...) tail(x, ...) ## S4 method for signature 'SessionManifest' tail(x, n = 5, ...) ## S4 method for signature 'PkgManifest' tail(x, n = 5, ...)
x |
A manifest object |
... |
unused |
n |
The number of packages to keep |
In the case of a PkgManifest
, the first or last n
packages are retained in the manifest, while all others are removed.
In the case of a SessionManifest
, n
specified versions
are retained, while the underlying PkgManifest
is unchanged.
An object of the same type as x
containing n
packages
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