Print the location in memory of a data frame

Source: R/location.R

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)
#> <0x557e8107d6e8>
#> Variables:
#>  * mpg:       <0x557e7c8adf00>
#>  * cyl:       <0x557e81a7ffd0>
#>  * disp:      <0x557e7fe69810>
#>  * hp:        <0x557e81f37000>
#>  * drat:      <0x557e7fbe37c0>
#>  * wt:        <0x557e81d21790>
#>  * qsec:      <0x557e81d98370>
#>  * vs:        <0x557e819f6880>
#>  * am:        <0x557e819da2d0>
#>  * gear:      <0x557e819d0970>
#>  * carb:      <0x557e819c8f40>
#> Attributes:
#>  * names:     <0x557e8107d638>
#>  * row.names: <0x557e819de430>
#>  * class:     <0x557e7efd4590>

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
location(mtcars2)
#> <0x557e8e1ef1c8>
#> Variables:
#>  * mpg:       <0x557e7c8adf00>
#>  * cyl:       <0x557e81a7ffd0>
#>  * disp:      <0x557e7fe69810>
#>  * hp:        <0x557e81f37000>
#>  * drat:      <0x557e7fbe37c0>
#>  * wt:        <0x557e81d21790>
#>  * qsec:      <0x557e81d98370>
#>  * vs:        <0x557e819f6880>
#>  * am:        <0x557e819da2d0>
#>  * gear:      <0x557e819d0970>
#>  * carb:      <0x557e819c8f40>
#>  * cyl2:      <0x557e85c3a830>
#> Attributes:
#>  * names:     <0x557e8e1ef068>
#>  * class:     <0x557e7f5375c0>
#>  * row.names: <0x557e8706b420>

changes(mtcars, mtcars)
#> <identical>
changes(mtcars, mtcars2)
#> Changed variables:
#>           old     new           
#> cyl2      <added> 0x557e85c3a830
#> 
#> Changed attributes:
#>           old            new           
#> names     0x557e8107d638 0x557e8e1ef068
#> row.names 0x557e819de430 0x557e84c9fa40
#> class     0x557e7efd4590 0x557e7f5375c0