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.
#> <0x5627efd972b8>
#> Variables:
#>  * mpg:       <0x5627ed220690>
#>  * cyl:       <0x5627ed362f70>
#>  * disp:      <0x5627eb8c2940>
#>  * hp:        <0x5627ebe6e3d0>
#>  * drat:      <0x5627ed1aaef0>
#>  * wt:        <0x5627e91c6b40>
#>  * qsec:      <0x5627ed389c90>
#>  * vs:        <0x5627ed389dd0>
#>  * am:        <0x5627ebabf9d0>
#>  * gear:      <0x5627ebabfb10>
#>  * carb:      <0x5627e93bfd70>
#> Attributes:
#>  * names:     <0x5627efd97208>
#>  * row.names: <0x5627e93bfeb0>
#>  * class:     <0x5627eedb35c8>
# ->
lobstr::ref(mtcars)
#> █ [1:0x5627efd972b8] <df[,11]> 
#> ├─mpg = [2:0x5627ed220690] <dbl> 
#> ├─cyl = [3:0x5627ed362f70] <dbl> 
#> ├─disp = [4:0x5627eb8c2940] <dbl> 
#> ├─hp = [5:0x5627ebe6e3d0] <dbl> 
#> ├─drat = [6:0x5627ed1aaef0] <dbl> 
#> ├─wt = [7:0x5627e91c6b40] <dbl> 
#> ├─qsec = [8:0x5627ed389c90] <dbl> 
#> ├─vs = [9:0x5627ed389dd0] <dbl> 
#> ├─am = [10:0x5627ebabf9d0] <dbl> 
#> ├─gear = [11:0x5627ebabfb10] <dbl> 
#> └─carb = [12:0x5627e93bfd70] <dbl> 

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
# ->
lobstr::ref(mtcars2)
#> █ [1:0x5627ebee7ba8] <df[,12]> 
#> ├─mpg = [2:0x5627ed220690] <dbl> 
#> ├─cyl = [3:0x5627ed362f70] <dbl> 
#> ├─disp = [4:0x5627eb8c2940] <dbl> 
#> ├─hp = [5:0x5627ebe6e3d0] <dbl> 
#> ├─drat = [6:0x5627ed1aaef0] <dbl> 
#> ├─wt = [7:0x5627e91c6b40] <dbl> 
#> ├─qsec = [8:0x5627ed389c90] <dbl> 
#> ├─vs = [9:0x5627ed389dd0] <dbl> 
#> ├─am = [10:0x5627ebabf9d0] <dbl> 
#> ├─gear = [11:0x5627ebabfb10] <dbl> 
#> ├─carb = [12:0x5627e93bfd70] <dbl> 
#> └─cyl2 = [13:0x5627ef13f920] <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> 0x5627ef13f920
#> 
#> Changed attributes:
#>           old            new           
#> names     0x5627efd97208 0x5627ebec5428
#> row.names 0x5627e93bfeb0 0x5627e99a0cc0
# ->
lobstr::ref(mtcars, mtcars2)
#> █ [1:0x5627efd972b8] <df[,11]> 
#> ├─mpg = [2:0x5627ed220690] <dbl> 
#> ├─cyl = [3:0x5627ed362f70] <dbl> 
#> ├─disp = [4:0x5627eb8c2940] <dbl> 
#> ├─hp = [5:0x5627ebe6e3d0] <dbl> 
#> ├─drat = [6:0x5627ed1aaef0] <dbl> 
#> ├─wt = [7:0x5627e91c6b40] <dbl> 
#> ├─qsec = [8:0x5627ed389c90] <dbl> 
#> ├─vs = [9:0x5627ed389dd0] <dbl> 
#> ├─am = [10:0x5627ebabf9d0] <dbl> 
#> ├─gear = [11:0x5627ebabfb10] <dbl> 
#> └─carb = [12:0x5627e93bfd70] <dbl> 
#>  
#> █ [13:0x5627ebee7ba8] <df[,12]> 
#> ├─mpg = [2:0x5627ed220690] 
#> ├─cyl = [3:0x5627ed362f70] 
#> ├─disp = [4:0x5627eb8c2940] 
#> ├─hp = [5:0x5627ebe6e3d0] 
#> ├─drat = [6:0x5627ed1aaef0] 
#> ├─wt = [7:0x5627e91c6b40] 
#> ├─qsec = [8:0x5627ed389c90] 
#> ├─vs = [9:0x5627ed389dd0] 
#> ├─am = [10:0x5627ebabf9d0] 
#> ├─gear = [11:0x5627ebabfb10] 
#> ├─carb = [12:0x5627e93bfd70] 
#> └─cyl2 = [14:0x5627ef13f920] <dbl>