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)
#> <0x56517328b978>
#> Variables:
#>  * mpg:       <0x56516dc228b0>
#>  * cyl:       <0x565173ce0bc0>
#>  * disp:      <0x565173d2e9e0>
#>  * hp:        <0x565173d2eb20>
#>  * drat:      <0x56516eb78710>
#>  * wt:        <0x56516eb78850>
#>  * qsec:      <0x5651733a9c50>
#>  * vs:        <0x5651733a9d90>
#>  * am:        <0x5651718424d0>
#>  * gear:      <0x565171842610>
#>  * carb:      <0x56516c815da0>
#> Attributes:
#>  * names:     <0x56517328b8c8>
#>  * row.names: <0x56516c815ee0>
#>  * class:     <0x56516f9ed5d8>

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
location(mtcars2)
#> <0x565180809d38>
#> Variables:
#>  * mpg:       <0x56516dc228b0>
#>  * cyl:       <0x565173ce0bc0>
#>  * disp:      <0x565173d2e9e0>
#>  * hp:        <0x565173d2eb20>
#>  * drat:      <0x56516eb78710>
#>  * wt:        <0x56516eb78850>
#>  * qsec:      <0x5651733a9c50>
#>  * vs:        <0x5651733a9d90>
#>  * am:        <0x5651718424d0>
#>  * gear:      <0x565171842610>
#>  * carb:      <0x56516c815da0>
#>  * cyl2:      <0x56517786ef50>
#> Attributes:
#>  * names:     <0x565180809b28>
#>  * class:     <0x56516fbcba38>
#>  * row.names: <0x5651781fb9f8>

changes(mtcars, mtcars)
#> <identical>
changes(mtcars, mtcars2)
#> Changed variables:
#>           old     new           
#> cyl2      <added> 0x56517786ef50
#> 
#> Changed attributes:
#>           old            new           
#> names     0x56517328b8c8 0x565180809b28
#> row.names 0x56516c815ee0 0x5651750036d0
#> class     0x56516f9ed5d8 0x56516fbcba38