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.
#> <0x55fc94a465e8>
#> Variables:
#>  * mpg:       <0x55fc92772f20>
#>  * cyl:       <0x55fc910527f0>
#>  * disp:      <0x55fc91052930>
#>  * hp:        <0x55fc92867960>
#>  * drat:      <0x55fc92867aa0>
#>  * wt:        <0x55fc92213cb0>
#>  * qsec:      <0x55fc92213df0>
#>  * vs:        <0x55fc92213f30>
#>  * am:        <0x55fc90e70af0>
#>  * gear:      <0x55fc90e70c30>
#>  * carb:      <0x55fc90e70d70>
#> Attributes:
#>  * names:     <0x55fc94a46538>
#>  * row.names: <0x55fc9260f620>
#>  * class:     <0x55fc946b12a0>
# ->
lobstr::ref(mtcars)
#> █ [1:0x55fc94a465e8] <df[,11]> 
#> ├─mpg = [2:0x55fc92772f20] <dbl> 
#> ├─cyl = [3:0x55fc910527f0] <dbl> 
#> ├─disp = [4:0x55fc91052930] <dbl> 
#> ├─hp = [5:0x55fc92867960] <dbl> 
#> ├─drat = [6:0x55fc92867aa0] <dbl> 
#> ├─wt = [7:0x55fc92213cb0] <dbl> 
#> ├─qsec = [8:0x55fc92213df0] <dbl> 
#> ├─vs = [9:0x55fc92213f30] <dbl> 
#> ├─am = [10:0x55fc90e70af0] <dbl> 
#> ├─gear = [11:0x55fc90e70c30] <dbl> 
#> └─carb = [12:0x55fc90e70d70] <dbl> 

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
# ->
lobstr::ref(mtcars2)
#> █ [1:0x55fc940fc188] <df[,12]> 
#> ├─mpg = [2:0x55fc92772f20] <dbl> 
#> ├─cyl = [3:0x55fc910527f0] <dbl> 
#> ├─disp = [4:0x55fc91052930] <dbl> 
#> ├─hp = [5:0x55fc92867960] <dbl> 
#> ├─drat = [6:0x55fc92867aa0] <dbl> 
#> ├─wt = [7:0x55fc92213cb0] <dbl> 
#> ├─qsec = [8:0x55fc92213df0] <dbl> 
#> ├─vs = [9:0x55fc92213f30] <dbl> 
#> ├─am = [10:0x55fc90e70af0] <dbl> 
#> ├─gear = [11:0x55fc90e70c30] <dbl> 
#> ├─carb = [12:0x55fc90e70d70] <dbl> 
#> └─cyl2 = [13:0x55fc8b74f750] <dbl> 

changes(mtcars, mtcars2)
#> Warning: `changes()` was deprecated in dplyr 1.0.0.
#> Please use `lobstr::ref()` instead.
#> Changed variables:
#>       old     new           
#> cyl2  <added> 0x55fc8b74f750
#> 
#> Changed attributes:
#>       old            new           
#> names 0x55fc94a46538 0x55fc95799628
# ->
lobstr::ref(mtcars, mtcars2)
#> █ [1:0x55fc94a465e8] <df[,11]> 
#> ├─mpg = [2:0x55fc92772f20] <dbl> 
#> ├─cyl = [3:0x55fc910527f0] <dbl> 
#> ├─disp = [4:0x55fc91052930] <dbl> 
#> ├─hp = [5:0x55fc92867960] <dbl> 
#> ├─drat = [6:0x55fc92867aa0] <dbl> 
#> ├─wt = [7:0x55fc92213cb0] <dbl> 
#> ├─qsec = [8:0x55fc92213df0] <dbl> 
#> ├─vs = [9:0x55fc92213f30] <dbl> 
#> ├─am = [10:0x55fc90e70af0] <dbl> 
#> ├─gear = [11:0x55fc90e70c30] <dbl> 
#> └─carb = [12:0x55fc90e70d70] <dbl> 
#>  
#> █ [13:0x55fc940fc188] <df[,12]> 
#> ├─mpg = [2:0x55fc92772f20] 
#> ├─cyl = [3:0x55fc910527f0] 
#> ├─disp = [4:0x55fc91052930] 
#> ├─hp = [5:0x55fc92867960] 
#> ├─drat = [6:0x55fc92867aa0] 
#> ├─wt = [7:0x55fc92213cb0] 
#> ├─qsec = [8:0x55fc92213df0] 
#> ├─vs = [9:0x55fc92213f30] 
#> ├─am = [10:0x55fc90e70af0] 
#> ├─gear = [11:0x55fc90e70c30] 
#> ├─carb = [12:0x55fc90e70d70] 
#> └─cyl2 = [14:0x55fc8b74f750] <dbl>