#30 Python Tutorial for Beginners | Copying an Array in Python

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In this lecture we will see:
- Addition of values in an array
- Different functions that can be performed on arrays
- What is Aliasing in python?
- Different ways of copying an array

#1
- We can add any value in each element of an array.
- We can also add values of two arrays.
- The addition of two arrays is known as Vectorized Operation.
- We can also find the values of each element of an array of mathematical operations such as sin, cos, tan, log, sqrt etc.
- Sum of every element of an array can also be calculated by using the sum() function.
- Minimum value can also be get from an array through the min() function.
- Maximum value can be get from an array by using the max() function.
- Unique elements from an array and the sorted array can also be get.
- Concatenation of two arrays can also be performed by using the concatenate function. This function combines two arrays.

#2
- Two variables can be pointed towards a single array. It means both variables are pointing to the same memory address where the array is stored.
- In Python, Aliasing happens whenever one variable's value is assigned to another variable.
- view() is a function that helps to create a new array at a new location. It means arrays should be present at the different memory addresses.
- By using the view() functions, two variables will point towards two different arrays.

#3
- In python, two copying techniques are available i.e.,
1. Shallow Copy
2. Deep Copy
- In shallow copy, it will copy elements but it means both arrays are dependent on each other.
- In shallow copy, if we update an element in one array then the changes would also be reflected in another array.
- In a deep copy, two different arrays are not linked with each other in any way.
- In a deep copy, we use the function known as a copy() instead of using the view() function.
- copy() function provides a deep copy of an array.

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[fazlurrehmanejazahmad]

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Thanks sir,
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[amitmiskin]

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[manojgokhale]

Not all superheroes wear capes, Some teach Python for free...

[danielkamau]

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[OgabekToshniyozov-klzs]

Hello Mr.Navin. Thank you so much for sharing valuable and interesting videos for us. I've started to learn Python by watching and practising your videos and everything is Ok.

[farnaazkhan]

finally I got deep and shallow copy from your videos....before I searched on web n didn't get ….thank you

[entertainmentcenter]

from numpy import *
arr =array([1, 2, 3, 4, 25])
arr1=array([15, 16, 20, 21, 5])
for i in range(len(arr)):
arr[i]=arr[i]+arr1[i]
print(arr)

print("bye")

[just_a_living_being]

thank you Sir : )
Ans:
1.
from numpy import *

array1 = ([])
array2 = ([])

size1 = int(input('Enter size of first array: '))
size2 = int(input('Enter size of second array: '))

print(f'Enter {size1} values in first in array: ')
for i in range(size1):
array1.append(int(input()))

print(f'Enter {size2} values in second array: ')
for i in range(size2):
array2.append(int(input()))

if size1 < size2:
for i in range(size1):
array2[i] = array1[i] + array2[i]
print(array2)
else:
for i in range(size2):
array1[i] = array1[i] + array2[i]
print(array1)


2.
from numpy import *

array = ([])

size = int(input('Enter size of array: '))

print(f'Enter {size} values in array: ')
for i in range(size):
array.append(int(input()))

max_value = array[0]
for i in range(1, size):
if max_value < array[i]:
max_value = array[i]

print(f'Maximum value = {max_value}')

[ashish]

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[wxtqojx]

#1
from numpy import *

arr1 = array([5, 10, 15, 20, 30])
arr2 = array([55, 16, 1, 280, 60])
arr3 = []

k = 0
for num1 in arr1:
num3 = num1 + arr2[k]
arr3.append(num3)
k += 1

print(arr3)


#2
def find_max(array):
max_value = array[0]
for i in range(1, len(array)):
if array[i] > max_value:
max_value = array[i]
return max_value

array = [3, 5, 7, 2, 9, 4, 6]
print("The max value in the array is", find_max(array))

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[bisrata.]

1) from numpy import *
a=array([1, 2, 3, 4, 5])
b=array([6, 7, 8, 9, 10])
c=array([i for i in a + [j for j in b]])
print(c)

[sreecharan]

i am absolutely loving it sir. you teach to the point and every minute i spend here feels like i am learning something new.a big thanks for your effort.

[abhishek-kapoor]

from array import *
arr = array('i', [1, 2, 3, 4, 5])
arr1 = array('i', [])


for i in range(len(arr)):
arr1.append(arr[i]+5)
print(arr1)

[shraddhadhawan]

You make learning really very easy.It is because of you that I developed interest in learning something new.
Thank You a Lot!!

[rithishreddy]

Don't know whether it's the best answer but as a beginner I feel good somewhat now.
#1)Write a code to add 2 arrays using forloop.
from numpy import *
arr1=[1, 2, 3, 4, 5]
arr2=[3, 1, 8, 9, 4]
arr=[]
for i in range(len(arr1)):
a= arr1[i] + arr2[i]
arr.append(a)
print(arr)
#2)Write a code to find the maximum value from an array without using in-built fuction
arr=[121, 54, 78, 343, 269, 313]
temp_max=arr[0]
for i in range(len(arr)):
if arr[i]>temp_max:
temp_max=arr[i]
print(temp_max)

[chughprabhkirat]

#1. add two arrays using for loop
from numpy import *
arr1 = array([1, 2, 3, 4, 5])
arr2 = array([12, 12, 12, 2, 2])
for i in range(len(arr1)):
sum = arr1[i]+arr2[i]
print(sum)


#2. find maximum value from array without using in-built function
from numpy import *
arr = array([23, 12, 56, 90])
max = arr[0] #suppose value at 0 index is the greatest
for i in range(len(arr)):
#compare
if arr[i]>max: #print(arr[i]) print the values present at a particular index
max = arr[i]
print(max)


#3. add 5 to each element of an array using for loop
from numpy import *
arr = array([15, 2, 55, 4, 5])
for i in range(len(arr)):
res = arr[i]+5
print(res)

[ishansaha]

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[snehajitchandra]

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[chanduv]

Adding 5 in single array set
from numpy import *
arr=array([1, 2, 3, 4, 5])
for i in range (5):
print(arr[i]+5)