Programming Assignment: Gaussian Elimination

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I am not able to understand what I am supposed to do in the programming assignment of week 2.

Where am I supposed to write the code?
Am I allowed to use the code already given in the exercise?

In the Gaussian Elimination lab, the first three sections are provided. You read the text and run the provided functions.

You don’t have to do anything until you get to Section 4, at Exercise 1. There you will implement the code in the reduced_row_echelon_form() function. You add your code to the places marked START CODE HERE.

Right. And what the code needs to do is described in pretty great detail in the previous instructions. You are turning those steps described in the instructions into code.

Maybe it would help to work an example with pencil and paper first, using the instructions. Then play out the same example with the code.