Data Science Desktop Survival Guide by Graham Williams
Desktop Survival Project Home Preface Data Science Introducing R R Constructs R Tasks R Strings R Read, Write, and Create Data Template Data Exploration Data Wrangling Data Visualisation Statistics ML Template ML Scenarios ML Activities ML Applications ML Algorithms Cluster Analysis Decision Trees Computer Vision Graph Data Privacy Literate Data Science Coding with Style Resources Bibliography Index

Effect on Data Storage

20180721 When the names of the variables within a dataset are changed R does not make a complete new copy of the dataset. Instead, the actual data in the column remains in tack whilst the variable itself (ds) references a new memory location where the new variable names get noted. The underlying data within the table is unaffected.

location(weather)

## Warning: `location()` is deprecated as of dplyr 1.0.0.
## Please use `lobst::ref()` instead.
## This warning is displayed once every 8 hours.
## Call `lifecycle::last_warnings()` to see where this warning was generated.

## <0x55ac47f65ac0>
## Variables:
##  * Date:          <0x55ac3ba4b7a0>
##  * Location:      <0x55ac4759f2f0>
##  * MinTemp:       <0x55ac47f64d10>
##  * MaxTemp:       <0x55ac441c5d30>
....

location(ds)

## <0x55ac4388ef80>
## Variables:
##  * date:            <0x55ac3f9464e0>
##  * location:        <0x55ac405b6050>
##  * min_temp:        <0x55ac40bdc900>
##  * max_temp:        <0x55ac407d2a40>
....