Creating a DataFrame
You are examining the students' grade data, which is available in your environment as grades_array. Each array element is a string of 4 letters for a student's mathematics, history, science, and drama grades.
In the last chapter, you wrote a function called get_gradenumber(grades, n) to select the nth grade from the grade string grade. The function's first argument is the grade string, and the second argument is the number n from 1-4. The grades in each string are for mathematics, history, science, and drama, respectively.
The DataFrames package has been imported for you with the using keyword.
This exercise is part of the course
Introduction to Julia
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Extract the mathematics grades
math_grades = ____.(____, ____)