有时在使用packrat时，在检查 packrat 库的状态时会得到这种输出：
> packrat::status()
The following packages are tracked by packrat, but are no longer available in the local library nor present in your code:
_
viridisLite 0.2.0
You can call packrat::snapshot() to remove these packages from the lockfile, or if you intend to use these packages, use packrat::restore() to restore them to your private library.
The following packages have been updated in your library, but have not been recorded in packrat:
library packrat
RSQLite 2.0 NA
blob 1.1.0 NA
formatR 1.5 NA
Use packrat::snapshot() to record these packages in packrat.
The following packages are out of sync between packrat and your current library:
packrat library
BH 1.65.0-1 1.60.0-2
R6 2.2.2 2.2.0
Rcpp 0.12.13 0.12.7
Rfacebook 0.6.17 0.6.15
assertthat 0.2.0 0.1
backports 1.1.1 1.0.5
colorspace 1.3-2 1.2-6
curl 3.0 2.1
dplyr 0.7.4 0.5.0
htmltools 0.3.6 0.3.5
httr 1.3.1 1.2.1
jsonlite 1.5 1.4
lazyeval 0.2.1 0.2.0
openssl 0.9.8 0.9.4
reshape2 1.4.2 1.4.1
scales 0.5.0 0.4.1
stringi 1.1.5 1.1.2
tibble 1.3.4 1.2
yaml 2.1.14 2.1.13
Use packrat::snapshot() to set packrat to use the current library, or use
packrat::restore() to reset the library to the last snapshot.
我的问题是：应该先运行哪一个，restore()或者snapshot()？我查看了 packrat 文档，但似乎没有一种方法可以执行参数化更新，即对包进行挑剔。
更新：
按照下面亚历克斯的建议，我收到了这个提示：
> packrat::restore()
Adding these packages to your library:
_
viridisLite 0.2.0
Removing these packages from your library:
_
RSQLite 2.0
blob 1.1.0
formatR 1.5
memoise 1.1.0
Upgrading these packages in your library:
from to
BH 1.60.0-2 1.65.0-1
R6 2.2.0 2.2.2
Rcpp 0.12.7 0.12.13
Rfacebook 0.6.15 0.6.17
assertthat 0.1 0.2.0
backports 1.0.5 1.1.1
colorspace 1.2-6 1.3-2
curl 2.1 3.0
dplyr 0.5.0 0.7.4
glue 1.1.1 1.2.0
htmltools 0.3.5 0.3.6
httr 1.2.1 1.3.1
jsonlite 1.4 1.5
lazyeval 0.2.0 0.2.1
openssl 0.9.4 0.9.8
reshape2 1.4.1 1.4.2
rlang 0.1.1 0.1.4
scales 0.4.1 0.5.0
stringi 1.1.2 1.1.5
tibble 1.2 1.3.4
yaml 2.1.13 2.1.14
Do you want to continue? [Y/n]:
答案是否定的。
我想要做的是删除viridislite，而不是添加它，我想添加RSQLite，blob并且formatR按照建议。
现在我也想知道是怎么memoise进入画面的......