6.1 Strings Setup

20180720 Packages used in this chapter include dplyr (Wickham et al. 2021), glue (Hester 2020), magrittr (Bache and Wickham 2020), readr (Wickham and Hester 2020), stringr (Wickham 2019b), stringi (Gagolewski et al. 2020), scales (Wickham and Seidel 2020), and rattle (G. Williams 2021).

Packages are loaded into the currently running R session from your local library directories on disk. Missing packages can be installed using utils::install.packages() within R. On Ubuntu, for example, R packages can also be installed using $ wajig install r-cran-<pkgname>.

# Load required packages from local library into the R session.

library(dplyr)        # Wrangling: mutate().
library(stringi)      # The string concat operator %s+%.
library(stringr)      # String manipulation.
library(glue)         # Format strings.
library(magrittr)     # Pipelines for data processing: %>% %T>% %<>%.
library(rattle)       # Weather dataset.
library(readr)        # Read/write: read_csv().
library(scales)       # commas(), percent().

After loading the required packages into the library we access the rattle::weatherAUS dataset and save it into the template dataset named ds, as per the template based approach introduced by Graham J. Williams (2017). The dataset is modestly large and is used extensively in this book to illustrate the capabilities of R for the Data Scientist.

# Initialise the dataset as per the template.
dsname <- "weatherAUS"
ds     <- get(dsname)
names(ds) %<>% normVarNames()

ds %>% sample_frac()

## # A tibble: 191,431 x 24
##    date       location         min_temp max_temp rainfall evaporation sunshine
##    <date>     <chr>               <dbl>    <dbl>    <dbl>       <dbl>    <dbl>
##  1 2011-12-23 Wollongong           17.6     23.3      0.8        NA       NA  
##  2 2015-04-15 MelbourneAirport     15.2     27.3      1.8         4.4      9.3
##  3 2017-06-26 PearceRAAF            1.5     17.8      0          NA        8.4
##  4 2013-08-25 Cobar                 5.6     22.4      0           3.4     NA  
##  5 2014-07-26 NorahHead            13.8     16.7      7          NA       NA  
##  6 2014-02-23 PearceRAAF           22.5     37.6      0          NA       12.2
##  7 2010-05-08 Ballarat              9.4     16.2      1.6        NA       NA  
##  8 2019-12-02 Nhil                  7.8     17.2      1.8        NA       NA  
##  9 2011-10-28 MelbourneAirport     14       26.6      0           8.8      6.2
## 10 2014-10-29 Townsville           20.7     30        0          10.6     11.1
## # … with 191,421 more rows, and 17 more variables: wind_gust_dir <ord>,
## #   wind_gust_speed <dbl>, wind_dir_9am <ord>, wind_dir_3pm <ord>,
## #   wind_speed_9am <dbl>, wind_speed_3pm <dbl>, humidity_9am <int>,
## #   humidity_3pm <int>, pressure_9am <dbl>, pressure_3pm <dbl>,
## #   cloud_9am <int>, cloud_3pm <int>, temp_9am <dbl>, temp_3pm <dbl>,
## #   rain_today <fct>, risk_mm <dbl>, rain_tomorrow <fct>

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