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)
#> <0x6c91aa8>
#> Variables:
#>  * mpg:       <0x5a88f70>
#>  * cyl:       <0x5a890b0>
#>  * disp:      <0x5a891f0>
#>  * hp:        <0x5a89330>
#>  * drat:      <0x587b230>
#>  * wt:        <0x587b370>
#>  * qsec:      <0x587b4b0>
#>  * vs:        <0x587b5f0>
#>  * am:        <0x587b730>
#>  * gear:      <0x587b870>
#>  * carb:      <0x587b9b0>
#> Attributes:
#>  * names:     <0x6c919f8>
#>  * row.names: <0x587baf0>
#>  * class:     <0x549fc48>

mtcars2 <- mutate(mtcars, cyl2 = cyl * 2)
location(mtcars2)
#> <0xdb0dd48>
#> Variables:
#>  * mpg:       <0x5a88f70>
#>  * cyl:       <0x5a890b0>
#>  * disp:      <0x5a891f0>
#>  * hp:        <0x5a89330>
#>  * drat:      <0x587b230>
#>  * wt:        <0x587b370>
#>  * qsec:      <0x587b4b0>
#>  * vs:        <0x587b5f0>
#>  * am:        <0x587b730>
#>  * gear:      <0x587b870>
#>  * carb:      <0x587b9b0>
#>  * cyl2:      <0xce95840>
#> Attributes:
#>  * names:     <0xdb0db38>
#>  * class:     <0x55ed9c0>
#>  * row.names: <0xd985720>

changes(mtcars, mtcars)
#> <identical>
changes(mtcars, mtcars2)
#> Changed variables:
#>           old     new      
#> cyl2      <added> 0xce95840
#> 
#> Changed attributes:
#>           old       new      
#> names     0x6c919f8 0xdb0db38
#> row.names 0x587baf0 0xd1cb7c8
#> class     0x549fc48 0x55ed9c0