Libraries import in R

R programming language provides several libraries that contain pre-existing functions to make programming tasks more efficient. To import a library in R, you can use the library() or require() function. Here are some examples:

# Using library() function
library(dplyr)          # loads the dplyr package
library(ggplot2)        # loads the ggplot2 package
# Using require() function

require(lubridate)      # loads the lubridate package

require(tidyr)          # loads the tidyr package

Note that the require() function returns a Boolean value indicating whether the package was successfully loaded (TRUE) or not (FALSE). On the other hand, the library() function does not return a value.

Once the libraries are imported, you can use their functions in your R code. For example:

# Using functions from dplyr package
df <- iris %>% 
  group_by(Species) %>% 
  summarize(mean_sepal_length = mean(Sepal.Length),
            mean_sepal_width = mean(Sepal.Width))
# Using functions from ggplot2 package

ggplot(df, aes(x = Species, y = mean_sepal_length)) +

  geom_bar(stat = "identity", fill = "blue")