Print the location in memory of a data frame

This is useful for understand how and when dplyr makes copies of data frames

location(df)

changes(x, y)

Arguments

df	a data frame
x, y	two data frames to compare

Examples

location(mtcars)
#> Warning: `location()` was deprecated in dplyr 1.0.0.
#> Please use `lobst::ref()` instead.
#> <0x562649b3f1b8>
#> Variables:
#>  * mpg:       <0x56264838b8c0>
#>  * cyl:       <0x562644711f80>
#>  * disp:      <0x5626441ce5d0>
#>  * hp:        <0x5626492f7e20>
#>  * drat:      <0x5626484eb850>
#>  * wt:        <0x56264c020380>
#>  * qsec:      <0x56264bc69300>
#>  * vs:        <0x562645f96ce0>
#>  * am:        <0x562649f55c50>
#>  * gear:      <0x56264402e3a0>
#>  * carb:      <0x56264bc51210>
#> Attributes:
#>  * names:     <0x562649b3f268>
#>  * row.names: <0x56264a02ef30>
#>  * class:     <0x56264ba32650>
# ->
lobstr::ref(mtcars)
#> █ [1:0x562649b3f1b8] <df[,11]> 
#> ├─mpg = [2:0x56264838b8c0] <dbl> 
#> ├─cyl = [3:0x562644711f80] <dbl> 
#> ├─disp = [4:0x5626441ce5d0] <dbl> 
#> ├─hp = [5:0x5626492f7e20] <dbl> 
#> ├─drat = [6:0x5626484eb850] <dbl> 
#> ├─wt = [7:0x56264c020380] <dbl> 
#> ├─qsec = [8:0x56264bc69300] <dbl> 
#> ├─vs = [9:0x562645f96ce0] <dbl> 
#> ├─am = [10:0x562649f55c50] <dbl> 
#> ├─gear = [11:0x56264402e3a0] <dbl> 
#> └─carb = [12:0x56264bc51210] <dbl> 

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
# ->
lobstr::ref(mtcars2)
#> █ [1:0x56264f7ee7d8] <df[,12]> 
#> ├─mpg = [2:0x56264838b8c0] <dbl> 
#> ├─cyl = [3:0x562644711f80] <dbl> 
#> ├─disp = [4:0x5626441ce5d0] <dbl> 
#> ├─hp = [5:0x5626492f7e20] <dbl> 
#> ├─drat = [6:0x5626484eb850] <dbl> 
#> ├─wt = [7:0x56264c020380] <dbl> 
#> ├─qsec = [8:0x56264bc69300] <dbl> 
#> ├─vs = [9:0x562645f96ce0] <dbl> 
#> ├─am = [10:0x562649f55c50] <dbl> 
#> ├─gear = [11:0x56264402e3a0] <dbl> 
#> ├─carb = [12:0x56264bc51210] <dbl> 
#> └─cyl2 = [13:0x56264eb956e0] <dbl> 

changes(mtcars, mtcars2)
#> Warning: `changes()` was deprecated in dplyr 1.0.0.
#> Please use `lobstr::ref()` instead.
#> Changed variables:
#>       old     new           
#> cyl2  <added> 0x56264eb956e0
#> 
#> Changed attributes:
#>       old            new           
#> names 0x562649b3f268 0x56264f7ee0f8
# ->
lobstr::ref(mtcars, mtcars2)
#> █ [1:0x562649b3f1b8] <df[,11]> 
#> ├─mpg = [2:0x56264838b8c0] <dbl> 
#> ├─cyl = [3:0x562644711f80] <dbl> 
#> ├─disp = [4:0x5626441ce5d0] <dbl> 
#> ├─hp = [5:0x5626492f7e20] <dbl> 
#> ├─drat = [6:0x5626484eb850] <dbl> 
#> ├─wt = [7:0x56264c020380] <dbl> 
#> ├─qsec = [8:0x56264bc69300] <dbl> 
#> ├─vs = [9:0x562645f96ce0] <dbl> 
#> ├─am = [10:0x562649f55c50] <dbl> 
#> ├─gear = [11:0x56264402e3a0] <dbl> 
#> └─carb = [12:0x56264bc51210] <dbl> 
#>  
#> █ [13:0x56264f7ee7d8] <df[,12]> 
#> ├─mpg = [2:0x56264838b8c0] 
#> ├─cyl = [3:0x562644711f80] 
#> ├─disp = [4:0x5626441ce5d0] 
#> ├─hp = [5:0x5626492f7e20] 
#> ├─drat = [6:0x5626484eb850] 
#> ├─wt = [7:0x56264c020380] 
#> ├─qsec = [8:0x56264bc69300] 
#> ├─vs = [9:0x562645f96ce0] 
#> ├─am = [10:0x562649f55c50] 
#> ├─gear = [11:0x56264402e3a0] 
#> ├─carb = [12:0x56264bc51210] 
#> └─cyl2 = [14:0x56264eb956e0] <dbl>