Syntax error numpy.tril Method in Python

numpy.tril Method in Python

We can use the numpy.tril() method to get the lower triangle of an array. Its syntax is as follows

Syntax

numpy.tril(m, k=0)

where,

  • m - number of rows in the array.

  • k - It is the diagonal. Use k=0 for the main diagonal. k < 0 is below the main diagonal and k > 0 is above it.

It returns a copy of the array after replacing all the elements above the k thdiagonal with zero.

Example 1

Let us consider the following example −

# import numpy library
import numpy as np

# create an input matrix
x = np.matrix([[20, 21, 22], [44 ,45, 46], [78, 79, 80]])
print("Matrix Input :
", x)

# numpy.tril() function
y = np.tril(x, -1)

# Display Tril Values
print("Tril Elements: 
", y)

Output

It will generate the following output −

Matrix Input :
[[20 21 22]
[44 45 46]
[78 79 80]]
Tril Elements:
[[ 0 0 0]
[44 0 0]
[78 79 0]]

Example 2

Let us take another example −

# import numpy library
import numpy as np

# create an input matrix
a = np.matrix([[1, 2], [3, 4], [5, 6], [7, 8]])
print("Matrix Input :
", a)

# numpy.tril() function
b = np.tril(a, -1)

# Display Tril Values
print("Tril Elements: 
", b)

Output

It will generate the following output −

Matrix Input :
[[1 2]
[3 4]
[5 6]
[7 8]]
Tril Elements:
[[0 0]
[3 0]
[5 6]
[7 8]]
Updated on: 2022-02-11T06:29:46+05:30

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