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.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_lifecycle_warnings()` to see where this warning was generated.
#> <0x563940e75d58>
#> Variables:
#>  * mpg:       <0x56393ff72ef0>
#>  * cyl:       <0x56393ff73030>
#>  * disp:      <0x56393ff73170>
#>  * hp:        <0x56393e21eea0>
#>  * drat:      <0x56393e21efe0>
#>  * wt:        <0x56393e21f120>
#>  * qsec:      <0x563938d14410>
#>  * vs:        <0x563938d14550>
#>  * am:        <0x563938d14690>
#>  * gear:      <0x56393d637ef0>
#>  * carb:      <0x56393d638030>
#> Attributes:
#>  * names:     <0x563940e75ca8>
#>  * row.names: <0x56393d638170>
#>  * class:     <0x56393fdaaa68>
# ->
lobstr::ref(mtcars)
#> █ [1:0x563940e75d58] <df[,11]> 
#> ├─mpg = [2:0x56393ff72ef0] <dbl> 
#> ├─cyl = [3:0x56393ff73030] <dbl> 
#> ├─disp = [4:0x56393ff73170] <dbl> 
#> ├─hp = [5:0x56393e21eea0] <dbl> 
#> ├─drat = [6:0x56393e21efe0] <dbl> 
#> ├─wt = [7:0x56393e21f120] <dbl> 
#> ├─qsec = [8:0x563938d14410] <dbl> 
#> ├─vs = [9:0x563938d14550] <dbl> 
#> ├─am = [10:0x563938d14690] <dbl> 
#> ├─gear = [11:0x56393d637ef0] <dbl> 
#> └─carb = [12:0x56393d638030] <dbl> 

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
# ->
lobstr::ref(mtcars2)
#> █ [1:0x563945cb4fc8] <df[,12]> 
#> ├─mpg = [2:0x56393ff72ef0] <dbl> 
#> ├─cyl = [3:0x56393ff73030] <dbl> 
#> ├─disp = [4:0x56393ff73170] <dbl> 
#> ├─hp = [5:0x56393e21eea0] <dbl> 
#> ├─drat = [6:0x56393e21efe0] <dbl> 
#> ├─wt = [7:0x56393e21f120] <dbl> 
#> ├─qsec = [8:0x563938d14410] <dbl> 
#> ├─vs = [9:0x563938d14550] <dbl> 
#> ├─am = [10:0x563938d14690] <dbl> 
#> ├─gear = [11:0x56393d637ef0] <dbl> 
#> ├─carb = [12:0x56393d638030] <dbl> 
#> └─cyl2 = [13:0x5639418d7ba0] <dbl> 

changes(mtcars, mtcars2)
#> Warning: `changes()` was deprecated in dplyr 1.0.0.
#> Please use `lobstr::ref()` instead.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_lifecycle_warnings()` to see where this warning was generated.
#> Changed variables:
#>       old     new           
#> cyl2  <added> 0x5639418d7ba0
#> 
#> Changed attributes:
#>       old            new           
#> names 0x563940e75ca8 0x563945cb4d08
# ->
lobstr::ref(mtcars, mtcars2)
#> █ [1:0x563940e75d58] <df[,11]> 
#> ├─mpg = [2:0x56393ff72ef0] <dbl> 
#> ├─cyl = [3:0x56393ff73030] <dbl> 
#> ├─disp = [4:0x56393ff73170] <dbl> 
#> ├─hp = [5:0x56393e21eea0] <dbl> 
#> ├─drat = [6:0x56393e21efe0] <dbl> 
#> ├─wt = [7:0x56393e21f120] <dbl> 
#> ├─qsec = [8:0x563938d14410] <dbl> 
#> ├─vs = [9:0x563938d14550] <dbl> 
#> ├─am = [10:0x563938d14690] <dbl> 
#> ├─gear = [11:0x56393d637ef0] <dbl> 
#> └─carb = [12:0x56393d638030] <dbl> 
#>  
#> █ [13:0x563945cb4fc8] <df[,12]> 
#> ├─mpg = [2:0x56393ff72ef0] 
#> ├─cyl = [3:0x56393ff73030] 
#> ├─disp = [4:0x56393ff73170] 
#> ├─hp = [5:0x56393e21eea0] 
#> ├─drat = [6:0x56393e21efe0] 
#> ├─wt = [7:0x56393e21f120] 
#> ├─qsec = [8:0x563938d14410] 
#> ├─vs = [9:0x563938d14550] 
#> ├─am = [10:0x563938d14690] 
#> ├─gear = [11:0x56393d637ef0] 
#> ├─carb = [12:0x56393d638030] 
#> └─cyl2 = [14:0x5639418d7ba0] <dbl>