# Find the maximum element of each row in a matrix using Python

In this article, we will learn a python program to find the maximum element of each row in a matrix.

Assume we have taken an NxN input matrix. We will now find the maximum element of each row in an input matrix using the below methods.

### Methos Used

The following are the various methods to accomplish this task −

• Using Nested For Loops

• Using max() function

• Using map(),lambda functions

## Method 1: Using Nested For Loops

### Algorithm (Steps)

Following are the Algorithm/steps to be followed to perform the desired task. −

• Create a function maximumRowElement() to print the maximum element of each row of an input matrix by accepting the input matrix as an argument.

• Get the number of rows of the matrix by calculating the length of the matrix using the len() function.

• Get the number of columns of the matrix by calculating the length of any row of the matrix.

• Traverse through the rows of the matrix using for loop

• Take a variable to store the maximum row element and initialize it to 0.

• Traverse through all the columns of a matrix using another nested for loop.

• Check whether the current element value is greater than the above max variable.

• If the above condition is true then set this element as the maximum value.

• Print the maximum value variable.

• Create a variable to store the input matrix and print the given matrix using nested for loops.

• Call the above-defined maximumRowElement() function by passing the input matrix as an argument to print the maximum element of each row in a matrix.

### Example

The following program returns the maximum element of each row of an input matrix using the nested for loop −

# creatind a function to get the maximum element in a
# row of a matrix by accepting the input matrix as an argument
def maximumRowElement(inputMatrix):
# getting the number of rows of the given matrix
rows = len(inputMatrix)
# getting the number of columns of the given matrix
cols = len(inputMatrix)
# traversing through the rows of the matrix
for p in range(rows):
# initializing maximum with 0 for finding a maximum element of each row
maximum = 0
# traversing through all the columns of a matrix
for q in range(cols):
# checking whether the current element value is greater than the max value
if inputMatrix[p][q] > maximum:
# assigning that element to the maximum now it becomes the maximum element
maximum = inputMatrix[p][q]
# printing the maximum element of each row of a matrix
print(maximum)
# input matrix(3x3 matrix)
inputMatrix = [[5, 1, 3, 4],
[6, 10, 8, 11],
[7, 2, 4, 3],
[1, 2, 3, 4]]

print("The Given Matrix is:")
# traversing through the rows of a matrix
for m in range(len(inputMatrix)):
# traversing through all the columns of the current row
for n in range(len(inputMatrix)):
# printing the corresponding element
print(inputMatrix[m][n], end=' ')
print()
print("maximum element in each row of an input matrix is:")
# calling the maximumRowElement() function by passing
# input matrix to it
maximumRowElement(inputMatrix)


### Output

On executing, the above program will generate the following output −

The Given Matrix is:
5 1 3 4
6 10 8 11
7 2 4 3
1 2 3 4
maximum element in each row of an input matrix is:
5
11
7
4


## Method 2: Using max() Function

The max() method(returns the highest-valued item/greatest numbers in an iterable)

### Example

The following program returns the maximum element of each row of an input matrix using the max() function −

# input matrix(3x3 matrix)
inputMatrix = [[5, 1, 3, 4],
[6, 10, 8, 11],
[7, 2, 4, 3],
[1, 2, 3, 4]]
print("The Given Matrix is:")
# traversing through the rows of a matrix
for m in range(len(inputMatrix)):
for n in range(len(inputMatrix)):
# printing the corresponding element
print(inputMatrix[m][n], end=' ')
print()

print("maximum element in each row of an input matrix is:")
# traversing through each row of elements of the  matrix
for k in inputMatrix:
# printing the maximum element in a row using the max() function
print(max(k))


### Output

The Given Matrix is:
5 1 3 4
6 10 8 11
7 2 4 3
1 2 3 4
maximum element in each row of an input matrix is:
5
11
7
4


## Method 3: Using map(), Lambda Functions

Using the built-in map() function is another method that can be used to get the largest element in each row of a matrix. The map() method applies a specified function on each element of an iterable in a definite way (such as a list or a matrix). The map() method may be used in this situation to apply the max() function to each row of the matrix.

### Example

The following program returns the maximum element of each row of an input matrix using the map(),lambda functions −

# input matrix(3x3 matrix)
inputMatrix = [[5, 1, 3, 4],
[6, 10, 8, 11],
[7, 2, 4, 3],
[1, 2, 3, 4]]
print("The Given Matrix is:")
# traversing through the rows of a matrix
for m in range(len(inputMatrix)):
# traversing through all the columns of the current row
for n in range(len(inputMatrix)):
# printing the corresponding element
print(inputMatrix[m][n], end=' ')
print()

print("maximum element in each row of an input matrix is:")
# Applying max() function to each list element(row) to get maximum value
result = list(map(lambda row: max(row), inputMatrix))
# Traversing in the result list
for i in result:
# Printing the maximum row element
print(i)


### Output

The Given Matrix is:
5 1 3 4
6 10 8 11
7 2 4 3
1 2 3 4
maximum element in each row of an input matrix is:
5
11
7
4


## Conclusion

In this article, we learned three different approaches of printing each row's highest value in the given matrix. We also learned how to apply a certain condition to each iterable using the map() function.