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.

**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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