11.28 Faceted Wind Direction


lblr <- function(x) 
  x %>%
    str_replace_all("n", "North ") %>%
    str_replace_all("s", "South ") %>%
    str_replace_all("e", "East ") %>%
    str_replace_all("w", "West ") %>%
    str_replace(" $", "")

ds %>%
  sample_n(10000) %>%
  ggplot(aes(x=min_temp, y=max_temp, colour=rain_tomorrow)) +
  geom_point(shape=".") +
  geom_smooth(method="gam", formula=y~s(x, bs="cs")) +
  facet_wrap(~wind_dir_3pm, labeller=labeller(wind_dir_3pm=lblr)) +
  labs(x      = vnames["min_temp"], 
       y      = vnames["max_temp"], 
       colour = vnames["rain_tomorrow"])

Labels of a faceted plot can be modified as here expanding n to North, s to South, etc. Observe that the linear relationship for rainy days is below that for dry days. The maximum temperature is generally closer to the minimum temperature on days where it rains the following day.

The function to remap the directions uses stringr::str_replace_all() to do the work. It is then transformed into a ggplot2::labeller() for wind_dir_3pm=.

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