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()` is deprecated as of dplyr 1.0.0.
#> Please use `lobst::ref()` instead.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_warnings()` to see where this warning was generated.
#> <0x5561402f1a78>
#> Variables:
#>  * mpg:       <0x55613b6e49c0>
#>  * cyl:       <0x55613b43c800>
#>  * disp:      <0x55613a9ee570>
#>  * hp:        <0x55613d51c260>
#>  * drat:      <0x55613c9bbcc0>
#>  * wt:        <0x55613ecad1d0>
#>  * qsec:      <0x55613f739040>
#>  * vs:        <0x55613b552e40>
#>  * am:        <0x55613b174d90>
#>  * gear:      <0x5561404813c0>
#>  * carb:      <0x55613e536150>
#> Attributes:
#>  * names:     <0x5561402f1bd8>
#>  * row.names: <0x556140811c50>
#>  * class:     <0x5561448c89e8>
# ->
lobstr::ref(mtcars)
#> █ [1:0x5561402f1a78] <df[,11]> 
#> ├─mpg = [2:0x55613b6e49c0] <dbl> 
#> ├─cyl = [3:0x55613b43c800] <dbl> 
#> ├─disp = [4:0x55613a9ee570] <dbl> 
#> ├─hp = [5:0x55613d51c260] <dbl> 
#> ├─drat = [6:0x55613c9bbcc0] <dbl> 
#> ├─wt = [7:0x55613ecad1d0] <dbl> 
#> ├─qsec = [8:0x55613f739040] <dbl> 
#> ├─vs = [9:0x55613b552e40] <dbl> 
#> ├─am = [10:0x55613b174d90] <dbl> 
#> ├─gear = [11:0x5561404813c0] <dbl> 
#> └─carb = [12:0x55613e536150] <dbl> 

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
# ->
lobstr::ref(mtcars2)
#> █ [1:0x55614596f5d8] <df[,12]> 
#> ├─mpg = [2:0x55613b6e49c0] <dbl> 
#> ├─cyl = [3:0x55613b43c800] <dbl> 
#> ├─disp = [4:0x55613a9ee570] <dbl> 
#> ├─hp = [5:0x55613d51c260] <dbl> 
#> ├─drat = [6:0x55613c9bbcc0] <dbl> 
#> ├─wt = [7:0x55613ecad1d0] <dbl> 
#> ├─qsec = [8:0x55613f739040] <dbl> 
#> ├─vs = [9:0x55613b552e40] <dbl> 
#> ├─am = [10:0x55613b174d90] <dbl> 
#> ├─gear = [11:0x5561404813c0] <dbl> 
#> ├─carb = [12:0x55613e536150] <dbl> 
#> └─cyl2 = [13:0x556141ed0f70] <dbl> 

changes(mtcars, mtcars2)
#> Warning: `changes()` is deprecated as of dplyr 1.0.0.
#> Please use `lobstr::ref()` instead.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_warnings()` to see where this warning was generated.
#> Changed variables:
#>           old     new           
#> cyl2      <added> 0x556141ed0f70
#> 
#> Changed attributes:
#>           old            new           
#> names     0x5561402f1bd8 0x55614596f318
#> row.names 0x556140811c50 0x5561456e96a0
# ->
lobstr::ref(mtcars, mtcars2)
#> █ [1:0x5561402f1a78] <df[,11]> 
#> ├─mpg = [2:0x55613b6e49c0] <dbl> 
#> ├─cyl = [3:0x55613b43c800] <dbl> 
#> ├─disp = [4:0x55613a9ee570] <dbl> 
#> ├─hp = [5:0x55613d51c260] <dbl> 
#> ├─drat = [6:0x55613c9bbcc0] <dbl> 
#> ├─wt = [7:0x55613ecad1d0] <dbl> 
#> ├─qsec = [8:0x55613f739040] <dbl> 
#> ├─vs = [9:0x55613b552e40] <dbl> 
#> ├─am = [10:0x55613b174d90] <dbl> 
#> ├─gear = [11:0x5561404813c0] <dbl> 
#> └─carb = [12:0x55613e536150] <dbl> 
#>  
#> █ [13:0x55614596f5d8] <df[,12]> 
#> ├─mpg = [2:0x55613b6e49c0] 
#> ├─cyl = [3:0x55613b43c800] 
#> ├─disp = [4:0x55613a9ee570] 
#> ├─hp = [5:0x55613d51c260] 
#> ├─drat = [6:0x55613c9bbcc0] 
#> ├─wt = [7:0x55613ecad1d0] 
#> ├─qsec = [8:0x55613f739040] 
#> ├─vs = [9:0x55613b552e40] 
#> ├─am = [10:0x55613b174d90] 
#> ├─gear = [11:0x5561404813c0] 
#> ├─carb = [12:0x55613e536150] 
#> └─cyl2 = [14:0x556141ed0f70] <dbl>