Exercise

Vectors II

In the previous assignment, you created 3 vectors: a numeric vector, a character vector and a boolean vector. Sometimes you only want to select a specific element from one of those vectors instead of using the entire vector. R makes this very easy using indexing.

Indexing entails the use of square brackets [] to select elements from a vector. For instance, numeric_vector[1] will select the first element of the vector numeric_vector. numeric_vector[c(1,3)] will select the first and the third element of the vector numeric_vector.

Instructions

100 XP

Select the letter "a" from character_vector
Select the second and the third element of boolean_vector

Take Hint (-30 XP)