Week 2, Mon, 4/7

from math import sqrt
class Vector():
    dim = 2
    def __init__(self, input_x, input_y):
        self.x = input_x
        self.y = input_y

    def normalize(self):
        l = self.length()
        self.scale(1/l)
        
    def length(self):
        l = sqrt(self.x**2+self.y**2)
        return l
    
    def scale(self, c):
        self.x = self.x * c
        self.y = self.y * c
    
    def __repr__(self):
        return f'({self.x}, {self.y})'

    def add(self, other):
        x = self.x + other.x
        y = self.y + other.y
        return Vector(x,y)

    def __add__(self, other):
        x = self.x + other.x
        y = self.y + other.y
        return Vector(x,y)
    
        

v = Vector(3,4)

print(v)

(3, 4)

v.normalize()

print(v)

(0.6000000000000001, 0.8)

Exercise from the note, implement matrix class

Determinant = ad-bc

transpose: swap b and c

Introduce random variable, PMF, PDF

See Probability and Statistics