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)
#> <0x111a357f8>
#> Variables:
#>  * mpg:       <0x101bebcb0>
#>  * cyl:       <0x115525ba0>
#>  * disp:      <0x115537590>
#>  * hp:        <0x115522de0>
#>  * drat:      <0x101ba4b10>
#>  * wt:        <0x101baf7d0>
#>  * qsec:      <0x115557b40>
#>  * vs:        <0x11554a2d0>
#>  * am:        <0x115545340>
#>  * gear:      <0x101bf6490>
#>  * carb:      <0x115503930>
#> Attributes:
#>  * names:     <0x111a358a0>
#>  * row.names: <0x1155046d0>
#>  * class:     <0x112afec78>

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
location(mtcars2)
#> <0x10f0c6ca0>
#> Variables:
#>  * mpg:       <0x101bebcb0>
#>  * cyl:       <0x115525ba0>
#>  * disp:      <0x115537590>
#>  * hp:        <0x115522de0>
#>  * drat:      <0x101ba4b10>
#>  * wt:        <0x101baf7d0>
#>  * qsec:      <0x115557b40>
#>  * vs:        <0x11554a2d0>
#>  * am:        <0x115545340>
#>  * gear:      <0x101bf6490>
#>  * carb:      <0x115503930>
#>  * cyl2:      <0x10b8f67a0>
#> Attributes:
#>  * class:     <0x111ed15a8>
#>  * names:     <0x10f0c6b50>
#>  * row.names: <0x10f0c6158>

changes(mtcars, mtcars)
#> <identical>
changes(mtcars, mtcars2)
#> Changed variables:
#>           old     new        
#> cyl2      <added> 0x10b8f67a0
#> 
#> Changed attributes:
#>           old         new        
#> names     0x111a358a0 0x10f0c6b50
#> row.names 0x1155046d0 0x112c98748
#> class     0x112afec78 0x111ed15a8