Python – Incremental Range Initialization in Matrix

Sometimes, while working with Python, we can have a problem in which we need to perform the initialization of Matrix. Simpler initialization is easier. But sometimes, we need to perform range incremental initialization. Lets discuss certain ways in which this task can be performed.

Method #1 : Using loop
This is brute way in which this task can be performed. In this, we iterate through the list and increase the value of element with the range specified.

# Python3 code to demonstrate
# Incremental Range Initialization in Matrix
# using loop

# Initializing row
r = 4

# Initializing col
c = 3

# Initializing range
rang = 5

# Incremental Range Initialization in Matrix
# using loop
res = []
temp = []
temp2 = 0
for idx in range(r):
    for idx in range(c):
        temp.append(temp2)
        temp2 = temp2 + rang
    res.append(temp)
    temp = []

# printing result
print ("Matrix after Initialization : " + str(res))

Output :

Matrix after Initialization : [[0, 5, 10], [15, 20, 25], [30, 35, 40], [45, 50, 55]]

Method #2 : Using list comprehension
This task can also be performed using list comprehension. The method is similar to above. The difference is this is a shorthand to perform this task.

# Python3 code to demonstrate
# Incremental Range Initialization in Matrix
# using list comprehension

# Initializing row
r = 4

# Initializing col
c = 3

# Initializing range
rang = 5

# Incremental Range Initialization in Matrix
# using list comprehension
res = [[rang * c * y + rang * x for x in range(c)] for y in range(r)]

# printing result
print ("Matrix after Initialization : " + str(res))

Output :

Matrix after Initialization : [[0, 5, 10], [15, 20, 25], [30, 35, 40], [45, 50, 55]]