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Python and The Basics of Programming.
Arrays


Lesson 4

Author: Egoshkin Danila Igorevichm

Arrays

Arrays

Variables vs Array

Variables 

#include <iostream> 

int main(){
    // Variables
    int myCoolNumber1 = 1; // Variable 1
    int myCoolNumber2 = 2; // Variable 2
    int myCoolNumber3 = 3; // Variable 3
    int myCoolNumber4 = 4; // Variable 4
    int myCoolNumber5 = 5; // Variable 5

    return 0;
}
Array 

#include <iostream> 

int main(){
    int myCoolNumbers[5] = {1,2,3,4,5}; // Array

    return 0;
}

Arrays in Python


numbers = [1, 2, 3] // but: it is not a simple array

import array as arr
a = arr.array('i', [1, 2, 3]) # creating an array with integer type

import numpy as np
np.array([1, 2, 3])
array([1, 2, 3])

Data Changing

Variables 

#include <iostream> 

int main(){
    // Variables
    int myCoolNumber1 = 1; // Variable 1
    int myCoolNumber2 = 2; // Variable 2
    int myCoolNumber3 = 3; // Variable 3
    int myCoolNumber4 = 4; // Variable 4
    int myCoolNumber5 = 5; // Variable 5

    myCoolNumber3 = 10;

    return 0;
}
Array 

#include <iostream> 

int main(){
    int myCoolNumbers[5] = {1,2,3,4,5}; // Array

    myCoolNumbers[2] = 10; // {1,2,10,4,5}

    return 0;
}

Array indexing starts from 0

Data Printing

Variables 

#include <iostream> 

int main(){
    // Variables
    int myCoolNumber1 = 1; // Variable 1
    int myCoolNumber2 = 2; // Variable 2
    int myCoolNumber3 = 3; // Variable 3
    int myCoolNumber4 = 4; // Variable 4
    int myCoolNumber5 = 5; // Variable 5

    myCoolNumber3 = 10;

    std::cout << "N1: " << myCoolNumber1 << "\n";
    std::cout << "N2: " << myCoolNumber2 << "\n";
    std::cout << "N3: " << myCoolNumber3 << "\n";
    std::cout << "N4: " << myCoolNumber4 << "\n";
    std::cout << "N5: " << myCoolNumber5 << "\n";
    return 0;
}
Array 

#include <iostream> 

int main(){
    int myCoolNumbers[5] = {1,2,3,4,5}; // Array

    myCoolNumbers[2] = 10; // {1,2,10,4,5} - Array indexing starts from 0 

    std::cout << "N1: " << myCoolNumbers[0] << "\n"; // - Array indexing starts from 0 
    std::cout << "N2: " << myCoolNumbers[1] << "\n";
    std::cout << "N3: " << myCoolNumbers[2] << "\n";
    std::cout << "N4: " << myCoolNumbers[3] << "\n";
    std::cout << "N5: " << myCoolNumbers[4] << "\n";

    return 0;
}

Data Printing with FOR

Variables 

#include <iostream> 

int main(){
    // Variables
    int myCoolNumber1 = 1; // Variable 1
    int myCoolNumber2 = 2; // Variable 2
    int myCoolNumber3 = 3; // Variable 3
    int myCoolNumber4 = 4; // Variable 4
    int myCoolNumber5 = 5; // Variable 5

    myCoolNumber3 = 10;

    std::cout << "N1: " << myCoolNumber1 << "\n";
    std::cout << "N2: " << myCoolNumber2 << "\n";
    std::cout << "N3: " << myCoolNumber3 << "\n";
    std::cout << "N4: " << myCoolNumber4 << "\n";
    std::cout << "N5: " << myCoolNumber5 << "\n";
    return 0;
}
Array with FOR 

#include <iostream> 

int main(){
    int myCoolNumbers[5] = {1,2,3,4,5}; // Array

    myCoolNumbers[2] = 10; // {1,2,10,4,5} - Array indexing starts from 0 

    for(int i = 0; i < 5; i++){
        std::cout << "N" << i+1 << ": " << myCoolNumbers[i] << "\n";
    }

    return 0;
}

Arrays in Python


numbers = [1, 2, 3] # but: it is not a simple array

import array as arr
a = arr.array('i', [1, 2, 3]) # creating an array with integer type

import numpy as np
np.array([1, 2, 3])
array([1, 2, 3])

Indexing and Slicing in Python


numbers = [1, 2, 3, 4, 5, 6, 7, 8] # but: it is not a simple array

print(numbers[0])
print(numbers[1])
print(numbers[2])

Array-list in Python


numbers = [1, 2, 3] # but: it is not a simple array
  • append() - Adds an element at the end of the list
  • clear() - Removes all the elements from the list
  • copy() - Returns a copy of the list
  • count() - Returns the number of elements with the specified value
  • extend() - Add the elements of a list (or any iterable), to the end of the current list
  • index() - Returns the index of the first element with the specified value
  • insert() - Adds an element at the specified position
  • pop() - Removes the element at the specified position
  • remove() - Removes the first item with the specified value
  • reverse() - Reverses the order of the list
  • sort() - Sorts the list

Special Types of Arrays

Special Types of Arrays: 1D, 2D, Jagged Array, 3D, 4D Tensor, QuadTree, OctaTree.

1D

2D


https://en.wikipedia.org/wiki/Confusion_matrix

Jagged Array

???

Jagged Array

Jagged Array

3D

3D, 4D Tensor, QuadTree, OctaTree.
https://en.wikipedia.org/wiki/Christoffel_symbols

Links:

Thanks for your attention :)