2 D arrays

Data Structures Arrays / Stacks, Queues and Linked Lists

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12/11 Nov Class Activity
1 Dimensional Arrays
2 Dimensional Arrays
Stacks    LIFO: last in first out
Queues: First in First Out  FIFO
Linked List Exercise

12/11 Nov Class Activity

  • 1
    Create Python code to set up a 1 dimensional array of items of your choice. 
  • 2
    Iterate thru the array and print out each array element.
  • 3
    Extend the array to be 2D by adding an additional row 
  • 4
    Iterate thru the 2D arrays printing out all elements in row 0 followed by all elements in row 1  
  • 5
    Write your solution to step 4 in IB Pseudo CODE
  • 6
    Create blog page and copy the python code and the pseudo code to that page and post solution to google classroom

1 Dimensional Arrays

An array is a data structure that lets you hold list of like items ( rather than use multiple variables)

Example if we wish to store a list of car manufactures we could hold as 1 dimensional array. Remember the first element starts at 0   

car_array = ["Volvo","BMW","Honda"]

In python we can iterate thru a list in 2 ways

car_array= ["bmw","honda"]

for i in range(len(car_array)):

    print(car_array[i])

car_array= ["bmw","honda"]

for element in car_array:

    print(element)

2 Dimensional Arrays

In real-world Often tasks have to store rectangular data table( board games for example). Such tables are called matrices or two-dimensional arrays. In Python any table can be represented as a list of lists (a list, where each element is in turn a list). 

When we process 2D arrays we use a loop with a loop : Write some code to print out each element in car_array 

car_array= [["bmw","honda"],["red","blue"]]

# row 0  =  bmw, honda

# row 1 = red, blue

print(car_array[1][0])

print(car_array[1][1])

a = [["bmw","honda"],["red","blue"]]

for  i in range (len(a)):

       for j in range (len(a[i])):

            #print each element in the array


print(car_array[1][1])

Stacks    LIFO: last in first out

Queues: First in First Out  FIFO

12/11 Nov Class Activity

  • 1
    Create Python code to set up a 1 dimensional array of items of your choice. 
  • 2
    Iterate thru the array and print out each array element.
  • 3
    Extend the array to be 2D by adding an additional row 
  • 4
    Iterate thru the 2D arrays printing out all elements in row 0 followed by all elements in row 1  
  • 5
    Write your solution to step 4 in IB Pseudo CODE
  • 6
    Create blog page and copy the python code and the pseudo code to that page and post solution to google classroom

1 Dimensional Arrays

An array is a data structure that lets you hold list of like items ( rather than use multiple variables)

Example if we wish to store a list of car manufactures we could hold as 1 dimensional array. Remember the first element starts at 0   

car_array = ["Volvo","BMW","Honda"]

In python we can iterate thru a list in 2 ways

car_array= ["bmw","honda"]

for i in range(len(car_array)):

    print(car_array[i])

car_array= ["bmw","honda"]

for element in car_array:

    print(element)

2 Dimensional Arrays

In real-world Often tasks have to store rectangular data table( board games for example). Such tables are called matrices or two-dimensional arrays. In Python any table can be represented as a list of lists (a list, where each element is in turn a list). 

When we process 2D arrays we use a loop with a loop : Write some code to print out each element in car_array 

car_array= [["bmw","honda"],["red","blue"]]

# row 0  =  bmw, honda

# row 1 = red, blue

print(car_array[1][0])

print(car_array[1][1])

a = [["bmw","honda"],["red","blue"]]

for  i in range (len(a)):

       for j in range (len(a[i])):

            #print each element in the array


print(car_array[1][1])

Stacks    LIFO: last in first out

Queues: First in First Out  FIFO

12/11 Nov Class Activity

  • 1
    Create Python code to set up a 1 dimensional array of items of your choice. 
  • 2
    Iterate thru the array and print out each array element.
  • 3
    Extend the array to be 2D by adding an additional row 
  • 4
    Iterate thru the 2D arrays printing out all elements in row 0 followed by all elements in row 1  
  • 5
    Write your solution to step 4 in IB Pseudo CODE
  • 6
    Create blog page and copy the python code and the pseudo code to that page and post solution to google classroom

1 Dimensional Arrays

An array is a data structure that lets you hold list of like items ( rather than use multiple variables)

Example if we wish to store a list of car manufactures we could hold as 1 dimensional array. Remember the first element starts at 0   

car_array = ["Volvo","BMW","Honda"]

In python we can iterate thru a list in 2 ways

car_array= ["bmw","honda"]

for i in range(len(car_array)):

    print(car_array[i])

car_array= ["bmw","honda"]

for element in car_array:

    print(element)

2 Dimensional Arrays

In real-world Often tasks have to store rectangular data table( board games for example). Such tables are called matrices or two-dimensional arrays. In Python any table can be represented as a list of lists (a list, where each element is in turn a list). 

When we process 2D arrays we use a loop with a loop : Write some code to print out each element in car_array 

car_array= [["bmw","honda"],["red","blue"]]

# row 0  =  bmw, honda

# row 1 = red, blue

print(car_array[1][0])

print(car_array[1][1])

a = [["bmw","honda"],["red","blue"]]

for  i in range (len(a)):

       for j in range (len(a[i])):

            #print each element in the array


print(car_array[1][1])

Stacks    LIFO: last in first out

Queues: First in First Out  FIFO

12/11 Nov Class Activity

  • 1
    Create Python code to set up a 1 dimensional array of items of your choice. 
  • 2
    Iterate thru the array and print out each array element.
  • 3
    Extend the array to be 2D by adding an additional row 
  • 4
    Iterate thru the 2D arrays printing out all elements in row 0 followed by all elements in row 1  
  • 5
    Write your solution to step 4 in IB Pseudo CODE
  • 6
    Create blog page and copy the python code and the pseudo code to that page and post solution to google classroom

1 Dimensional Arrays

An array is a data structure that lets you hold list of like items ( rather than use multiple variables)

Example if we wish to store a list of car manufactures we could hold as 1 dimensional array. Remember the first element starts at 0   

car_array = ["Volvo","BMW","Honda"]

In python we can iterate thru a list in 2 ways

car_array= ["bmw","honda"]

for i in range(len(car_array)):

    print(car_array[i])

car_array= ["bmw","honda"]

for element in car_array:

    print(element)

2 Dimensional Arrays

In real-world Often tasks have to store rectangular data table( board games for example). Such tables are called matrices or two-dimensional arrays. In Python any table can be represented as a list of lists (a list, where each element is in turn a list). 

When we process 2D arrays we use a loop with a loop : Write some code to print out each element in car_array 

car_array= [["bmw","honda"],["red","blue"]]

# row 0  =  bmw, honda

# row 1 = red, blue

print(car_array[1][0])

print(car_array[1][1])

a = [["bmw","honda"],["red","blue"]]

for  i in range (len(a)):

       for j in range (len(a[i])):

            #print each element in the array


print(car_array[1][1])

Stacks    LIFO: last in first out

Queues: First in First Out  FIFO

Linked List Exercise

Arrays                            VS

               Linked Lists

Fast Access

Linear /  Sequential Access 

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