## Description

## Objectives:

1. Apply vector operations to translate, scale, and rotate a set of points representing an

image.

2. Perform various operations with or on vectors: addition, subtraction, dot product, norm.

## NOTES:

1. Unless otherwise stated in the FIXME comment, you may not change the outline of the

algorithm provided by introducing new loops or conditionals, or by calling any built-in

functions that perform the entire algorithm or replaces a part of the algorithm.

2. You may import and use the Python math module to obtain the value for and to

calculate sine, cosine, and tangent functions, if needed.

## Problem 1:

Create a function translate(S, z0) that translates the points in the input set by

. The function should satisfy the following:

1. INPUT:

S – set S

z0 – complex number

2. OUT:

T – set T consisting of points in S translated by

e

S

z0 = a0 + b0i

z0

In [ ]:

def translate(S, z0):

“””

translates the complex numbers of set S by z0

:param S: set type; a set of complex numbers

:param z0: complex type; a complex number

CECS 229 Programming Assignment 4

## Problem 2:

Create a function scale(S, k) that scales the points in the input set by a factor of :

1. INPUT:

S – set S

k – positive float, raises ValueError if k 0.

2. OUTPUT:

a set consisting of points in S scaled by .

## Problem 3:

Create a function rotate(S, tau) that rotates the points in the input set by radians:

1. INPUT:

S – set S

tau – float. If negative, the rotation is clockwise. If positive the rotation is

counterclockwise. If zero, no rotation.

2. OUT:

a set consisting of points in S rotated by

:return: set type; a set consisting of points in S translated by z0

“””

# FIXME: Implement this function

# FIXME: Return correct output

return None

S k

≤

k

In [ ]:

def scale(S, k):

“””

scales the complex numbers of set S by k.

:param S: set type; a set of complex numbers

:param k: float type; positive real number

:return: set type; a set consisting of points in S scaled by k

:raise: raises ValueError if k <= 0

“””

# FIXME: Implement this function.

# FIXME: Return correct output

return None

S τ

τ

In [ ]:

def rotate(S, tau):

“””

rotates the complex numbers of set S by tau radians.

:param S: set type; – set of complex numbers

:param tau: float type; radian measure of the rotation value. If negative, the rot

If positive the rotation is counterclockwise. If zero, no rotation.

:returns: set type; a set consisting of points in S rotated by tau radians

“””

# FIXME: Implement this function.

# FIXME: Return correct output

return None

CECS 229 Programming Assignment 4

## Problem 4:

Finish the implementation of class Vec which instantiates row-vector objects with defined

operations of addition, subtraction, scalar multiplication, and dot product. In addition, Vec

class overloads the Python built-in function abs() so that when it is called on a Vec object, it

returns the Euclidean norm of the vector.

In [ ]:

class Vec:

def __init__(self, contents = []):

“””

Constructor defaults to empty vector

INPUT: list of elements to initialize a vector object, defaults to empty list

“””

self.elements = contents

return

def __abs__(self):

“””

Overloads the built-in function abs(v)

:returns: float type; the Euclidean norm of vector v

“””

# FIXME: Implement this method

# FIXME: Return correct output

return None

def __add__(self, other):

“””

overloads the + operator to support Vec + Vec

:raises: ValueError if vectors are not same length

:returns: Vec type; a Vec object that is the sum vector of this Vec and ‘other

“””

# FIXME: Finish the implementation

# FIXME: Return correct output

return None

def __sub__(self, other):

“””

overloads the – operator to support Vec – Vec

:raises: ValueError if vectors are not same length

:returns: Vec type; a Vec object that is the difference vector of this Vec and

“””

# FIXME: Finish the implementation

# FIXME: Return correct output

return None

def __mul__(self, other):

“””

Overloads the * operator to support

– Vec * Vec (dot product) raises ValueError if vectors are not

same length in the case of dot product; returns scalar

– Vec * float (component-wise product); returns Vec object

– Vec * int (component-wise product); returns Vec object

“””

if type(other) == Vec: #define dot product

# FIXME: Complete the implementation

# FIXME: Return the correct output

return None

elif type(other) == float or type(other) == int: #scalar-vector multiplication

# FIXME: Complete the implementation

# FIXME: Return the correct output

return None

def __rmul__(self, other):

“””Overloads the * operation to support

– float * Vec; returns Vec object

– int * Vec; returns Vec object

“””

# FIXME: Complete the implementation

# FIXME: Return the correct output

return None

def __str__(self):

“””returns string representation of this Vec object”””

return str(self.elements) # does NOT need further implementation

CECS 229 Programming Assignment 4