Vectorized operations apply operations to entire vectors or matrices without explicit element-by-element loops.
R for Data Analytics MCQ - Advanced R Programming
tapply() applies a function to subsets of a vector defined by one or more grouping factors.
lapply() consistently returns a list, whereas sapply() simplifies the output when possible.
1 is stored as a double while 1L is an integer, so identical() returns FALSE.
all.equal() is useful for testing approximate equality, especially for floating-point values.
