In the previous article, we have discussed Python Program to Check Diagonally Dominant Matrix
Given a square matrix, the task is to get the frequency of even numbers and odd numbers of a given matrix in python.
What is a matrix:
A matrix is a rectangular sequence of numbers divided into columns and rows. A matrix element or entry is a number that appears in a matrix.
Example:
Above is the matrix which contains 5 rows and 4 columns and having elements from 1 to 20.
In this order, the dimensions of a matrix indicate the number of rows and columns.
Here as there are 5 rows and 4 columns it is called a 5*4 matrix.
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Examples:
Example1:
Input:
Given Matrix : 9 0 2 7 5 6 7 1 9
Output:
The odd number frequency of the given matrix = 6 The even number frequency of the given matrix 3
Example2:
Input:
Given Matrix : 5 3 2 8 4 1 7 2 3
Output:
The odd number frequency of the given matrix = 5 The even number frequency of the given matrix 4
Program for Frequencies of Even and Odd Numbers in a Matrix
Below are the ways to get the frequency of even numbers and odd numbers of a given matrix in python:
Method #1: Using For Loop (Static Input)
Approach:
- Give the matrix as static input and store it in a variable.
- Calculate the number of rows of the given matrix by calculating the length of the nested list using the len() function and store it in a variable mtrxrows.
- Calculate the number of columns of the given matrix by calculating the length of the first list in the nested list using the len() function and store it in a variable mtrxcolums.
- Take a variable to say evnnum_freqcy and initialize its value to 0.
- Take another variable to say oddnum_freqcy and initialize its value to 0.
- Loop till the given number of rows using the For loop.
- Inside the For loop, Iterate till the given number of columns using another Nested For loop(Inner For loop).
- Check if the mtrx[n][m] is even using the if conditional statement (where n is the iterator value of the parent For loop and m is the iterator value of the inner For loop.).
- If it is true, then increment the value of above evnnum_freqcy by 1.
- Else increment the value of above oddnum_freqcy by 1.
- Print the frequency of even numbers and odd numbers of a given matrix.
- The Exit of the Program.
Below is the implementation:
# Give the matrix as static input and store it in a variable.
mtrx = [[9, 0, 2],
[7, 5, 6],
[7, 1, 9]]
# Calculate the number of rows of the given matrix by
# calculating the length of the nested list using the len() function
# and store it in a variable mtrxrows.
mtrxrows = len(mtrx)
# Calculate the number of columns of the given matrix by
# calculating the length of the first list in the nested list
# using the len() function and store it in a variable mtrxcols.
mtrxcols = len(mtrx[0])
# Take a variable to say evnnum_freqcy and initialize its value to 0.
evnnum_freqcy = 0
# Take another variable to say oddnum_freqcy and initialize its value to 0.
oddnum_freqcy = 0
# Loop till the given number of rows using the For loop.
for n in range(mtrxrows):
# Inside the For loop, Iterate till the given number of columns using another Nested
# For loop(Inner For loop).
for m in range(mtrxcols):
# Check if the mtrx[n][m] is even using the if conditional statement (where n is the
# iterator value of the parent For loop and m is the iterator value of the
# inner For loop.).
if ((mtrx[n][m] % 2) == 0):
# If it is true, then increment the value of above evnnum_freqcy by 1.
evnnum_freqcy += 1
else:
# Else increment the value of above oddnum_freqcy by 1.
oddnum_freqcy += 1
# Print the frequency of even numbers and odd numbers of a given matrix.
print(" The odd number frequency of the given matrix =", oddnum_freqcy)
print(" The even number frequency of the given matrix ", evnnum_freqcy)
Output:
The odd number frequency of the given matrix = 6 The even number frequency of the given matrix 3
Method #2: Using For loop (User Input)
Approach:
- Give the number of rows of the matrix as user input using the int(input()) function and store it in a variable.
- Give the number of columns of the matrix as user input using the int(input()) function and store it in another variable.
- Take a list and initialize it with an empty value using [] or list() to say gvnmatrix.
- Loop till the given number of rows using the For loop
- Inside the For loop, Give all the row elements of the given Matrix as a list using the list(),map(),int(),split() functions and store it in a variable.
- Add the above row elements list to gvnmatrix using the append() function.
- Take a variable to say evnnum_freqcy and initialize its value to 0.
- Take another variable to say oddnum_freqcy and initialize its value to 0.
- Loop till the given number of rows using the For loop.
- Inside the For loop, Iterate till the given number of columns using another Nested For loop(Inner For loop).
- Check if the mtrx[n][m] is even using the if conditional statement (where n is the iterator value of the parent For loop and m is the iterator value of the inner For loop.).
- If it is true, then increment the value of above evnnum_freqcy by 1.
- Else increment the value of above oddnum_freqcy by 1.
- Print the frequency of even numbers and odd numbers of a given matrix.
- The Exit of the Program.
Below is the implementation:
# Give the number of rows of the matrix as user input using the int(input()) function
# and store it in a variable.
mtrxrows = int(input('Enter some random number of rows of the matrix = '))
# Give the number of columns of the matrix as user input using the int(input()) function
# and store it in another variable.
mtrxcols = int(input('Enter some random number of columns of the matrix = '))
# Take a list and initialize it with an empty value using [] or list() to say gvnmatrix.
mtrx = []
# Loop till the given number of rows using the For loop
for n in range(mtrxrows):
# Inside the For loop, Give all the row elements of the given Matrix as a list using
# the list(),map(),int(),split() functions and store it in a variable.
l = list(map(int, input(
'Enter {'+str(mtrxcols)+'} elements of row {'+str(n+1)+'} separated by spaces = ').split()))
# Add the above row elements list to gvnmatrix using the append() function.
mtrx.append(l)
# Take a variable to say evnnum_freqcy and initialize its value to 0.
evnnum_freqcy = 0
# Take another variable to say oddnum_freqcy and initialize its value to 0.
oddnum_freqcy = 0
# Loop till the given number of rows using the For loop.
for n in range(mtrxrows):
# Inside the For loop, Iterate till the given number of columns using another Nested
# For loop(Inner For loop).
for m in range(mtrxcols):
# Check if the mtrx[n][m] is even using the if conditional statement (where n is the
# iterator value of the parent For loop and m is the iterator value of the
# inner For loop.).
if ((mtrx[n][m] % 2) == 0):
# If it is true, then increment the value of above evnnum_freqcy by 1.
evnnum_freqcy += 1
else:
# Else increment the value of above oddnum_freqcy by 1.
oddnum_freqcy += 1
# Print the frequency of even numbers and odd numbers of a given matrix.
print(" The odd number frequency of the given matrix =", oddnum_freqcy)
print(" The even number frequency of the given matrix ", evnnum_freqcy)
Output:
Enter some random number of rows of the matrix = 3
Enter some random number of columns of the matrix = 3
Enter {3} elements of row {1} separated by spaces = 5 3 2
Enter {3} elements of row {2} separated by spaces = 8 4 1
Enter {3} elements of row {3} separated by spaces = 7 2 3
The odd number frequency of the given matrix = 5
The even number frequency of the given matrix 4
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