The provided R code creates a **tibble** named `df`. A...

The provided R code creates a tibble named df. A tibble is a modern take on data frames in R, provided by the tibble package, which is part of the tidyverse.

Here is what this code does in detail:

1. df <- tibble(...):

   • This initializes a tibble object named df with the specified columns.

2. index = seq_along(res):

   • A column named index is created.
   • seq_along(res) generates a sequence of integers from 1 to the length of the vector res. In other words, it creates a numeric index corresponding to the positions in res.

3. resid = res:

   • A column named resid is created and populated with the contents of the variable res. The variable res must be defined elsewhere in your script as some sort of vector (e.g., numeric or character data).

Summary:

This code creates a tibble with two columns:

• index: Sequence of integers from 1 to the length of the res vector.
• resid: Contains the values of the res vector.

For example, if res = c(10, 20, 30), the code would produce:

# A tibble: 3 × 2
  index resid
  <int> <dbl>
1     1    10
2     2    20
3     3    30