To create an m$-$file in Matlab you should implement the following steps:

Introduce the grades in a matrix format. Create a matrix with first column being the

course number $($this column is just for your reference and will not be actually used for

calculations$),$ a second column for the number of credits of that course, and a third

column for the grade. The easiest way would be to introduce the numerical equivalent of

the grade $(4$ for an A$,3\mathrm{.}7$ for A$-,3\mathrm{.}3$ for B$+,3$ for a B$,2\mathrm{.}7$ for B$-,$ and so on$).$ For

example for ENGT$305$ course if your grade is A$-,$ the corresponding row in matrix A

will be $[30533\mathrm{.}7].$

Using a for loop, go through all the courses in your matrix $($in other words through all

the lines on the matrix$)$ and calculate a weighted sum of the grades. In the same time,

you should also keep track of the total number of credits added.

Your final GPA will be the weighted sum divided by the total number of credits.

You may test your code with your own grades from DegreeWorks if you want, but for the

exam you should just introduce some random example, with at least $5$ courses in the initial

matrix.

b$)$ Once a GPA is calculated, add commands to read a new course grade and calculate

what correction the new grade will produce. $($You do not need to redo all the calculations

with all the grades, you need to use the GPA already calculated and do a correction to it

based on the new grade added.$)$ To test this part check what increase a new course of $3$

credits with a grade of A will produce and what penalty a grade of F will produce.