instructions.md

Designing a Simple 2d Vector Class

Instructions

• 2/14/23

  • Before changing anything, check out a new branch in which to work.

  • Write an __init__ method for Vector2d that has positional parameters for the x and y components that correspond to the instance variables self.x and self.y

  • Write a __repr__ method for the Vector2d class. A good general rule for repr is that it should produce a string similar to the code used to create the object it describes. For example, repr(Vector2d(3,4)) could produce 'Vector2d(x=3, y=4)'.

  • Write a __str__ method for the Vector2d class such that str(Vector2d(3, 4)) would return '3i + 4j'. (i and j are what many physicists and engineers use to denote the x and y directions)

  • Write an __abs__ function that takes self as its only argument and returns the length of the hypotenuse of the right triangle with legs equal to self.x and self.y. For example, abs(Vector2d(3, 4)) should return 5.0.

  • Once you've finished today's work, commit your changes and push them to your repository.

• 2/16/23

  • The __neg__ method determines the behavior of the unary minus (leading minus sign) on a Vector2d object.Write a __neg__ method that takes self as its only argument and returns a Vector2d object with the signs for x and y negated. For example, -Vector2d(3, 4) would return Vector2d(-3, -4).

  • The __add__ method determines how the '+' symbol works between two Vector2d objects. Write an __add__ method that has two arguments, self and other, and produces a Vector2d object with the correct components. Remember that when we add vectors, we simply add their like components. For example: Vector2d(3, 4) + Vector2d(1, -1) should return Vector2d(4, 3), since 3 + 1 = 4 and 4 + -1 = 3.

  • Once you've finished the day's work, commit your changes and push them to your repository.