Nothing
## ----setup, include = FALSE---------------------------------------------------
knitr::opts_chunk$set(
collapse = TRUE,
comment = "#>"
)
## ----eval=FALSE, echo=TRUE----------------------------------------------------
# library(libr)
#
# # Create temp directory
# tmp <- tempdir()
#
# # Save some data to temp directory
# # for illustration purposes
# saveRDS(trees, file.path(tmp, "trees.rds"))
# saveRDS(rock, file.path(tmp, "rocks.rds"))
#
# # Create library
# libname(dat, tmp)
# # library 'dat': 2 items
# # - attributes: not loaded
# # - path: C:\Users\User\AppData\Local\Temp\RtmpCSJ6Gc
# # - items:
# # Name Extension Rows Cols Size LastModified
# # 1 rocks rds 48 4 3.1 Kb 2020-11-05 23:25:34
# # 2 trees rds 31 3 2.4 Kb 2020-11-05 23:25:34
#
# # Examine data dictionary for library
# dictionary(dat)
# # A tibble: 7 x 9
# # Name Column Class Label Description Format Width Rows NAs
# # <chr> <chr> <chr> <lgl> <lgl> <lgl> <lgl> <int> <int>
# # 1 rocks area integer NA NA NA NA 48 0
# # 2 rocks peri numeric NA NA NA NA 48 0
# # 3 rocks shape numeric NA NA NA NA 48 0
# # 4 rocks perm numeric NA NA NA NA 48 0
# # 5 trees Girth numeric NA NA NA NA 31 0
# # 6 trees Height numeric NA NA NA NA 31 0
# # 7 trees Volume numeric NA NA NA NA 31 0
#
# # Load library
# lib_load(dat)
#
# # Examine workspace
# ls()
# # [1] "dat" "dat.rocks" "dat.trees" "tmp"
#
# # Use data from the library
# summary(dat.rocks)
# # area peri shape perm
# # Min. : 1016 Min. : 308.6 Min. :0.09033 Min. : 6.30
# # 1st Qu.: 5305 1st Qu.:1414.9 1st Qu.:0.16226 1st Qu.: 76.45
# # Median : 7487 Median :2536.2 Median :0.19886 Median : 130.50
# # Mean : 7188 Mean :2682.2 Mean :0.21811 Mean : 415.45
# # 3rd Qu.: 8870 3rd Qu.:3989.5 3rd Qu.:0.26267 3rd Qu.: 777.50
# # Max. :12212 Max. :4864.2 Max. :0.46413 Max. :1300.00
#
# # Add data to the library
# dat.trees_subset <- subset(dat.trees, Girth > 11)
#
# # Add more data to the library
# dat.cars <- mtcars
#
# # Unload the library from memory
# lib_unload(dat)
#
# # Examine workspace again
# ls()
# # [1] "dat" "tmp"
#
# # Write the library to disk
# lib_write(dat)
# # library 'dat': 4 items
# # - attributes: not loaded
# # - path: C:\Users\User\AppData\Local\Temp\RtmpCSJ6Gc
# # - items:
# # Name Extension Rows Cols Size LastModified
# # 1 rocks rds 48 4 3.1 Kb 2020-11-05 23:37:45
# # 2 trees rds 31 3 2.4 Kb 2020-11-05 23:37:45
# # 3 cars rds 32 11 7.3 Kb 2020-11-05 23:37:45
# # 4 trees_subset rds 23 3 1.8 Kb 2020-11-05 23:37:45
#
# # Clean up
# lib_delete(dat)
#
# # Examine workspace again
# ls()
# # [1] "tmp"
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