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numpy.triu Method in Python
The numpy.triu() method can be used to get the upper triangle of an array. Its syntax is as follows −
Syntax
numpy.triu(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 kth diagonal with zero.
Example 1
Let us consider the following example −
# import numpy library import numpy as np # create an input matrix x = np.matrix([[6, 7], [8, 9], [10, 11]]) print("Input of Matrix :
", x) # numpy.triu() function y = np.triu(x, 1) # Display Triu Values print("Triu Elements:
", y)
Output
It will generate the following output −
Input of Matrix : [[ 6 7] [ 8 9] [10 11]] Triu Elements: [[0 7] [0 0] [0 0]]
Example 2
Let us take another example −
# import numpy library import numpy as np # create an input matrix a = np.matrix([[11, 12, 13], [20, 21, 22], [44, 45, 46]]) print("Input of Matrix :
", a) # numpy.triu() function b = np.triu(a, -1) # Display Triu Values print("Triu Elements:
", b)
Output
It will generate the following output −
Input of Matrix : [[11 12 13] [20 21 22] [44 45 46]] Triu Elements: [[11 12 13] [20 21 22] [ 0 45 46]]
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