NumPy: Test comparison operators
Write a NumPy program to test equal, not equal, greater equal, greater and less test of all the elements of two given arrays.
Sample Solution:
Python Code:
# Importing necessary library
import numpy as np
# Creating two NumPy arrays containing strings
x1 = np.array(['Hello', 'PHP', 'JS', 'examples', 'html'], dtype=np.str)
x2 = np.array(['Hello', 'php', 'Java', 'examples', 'html'], dtype=np.str)
# Displaying the content of Array1
print("\nArray1:")
print(x1)
# Displaying the content of Array2
print("Array2:")
print(x2)
# Comparing the strings in x1 and x2 element-wise for equality
print("\nEqual test:")
r = np.char.equal(x1, x2)
print(r)
# Comparing the strings in x1 and x2 element-wise for inequality
print("\nNot equal test:")
r = np.char.not_equal(x1, x2)
print(r)
# Comparing the strings in x1 and x2 element-wise to check if x1 is less than or equal to x2
print("\nLess equal test:")
r = np.char.less_equal(x1, x2)
print(r)
# Comparing the strings in x1 and x2 element-wise to check if x1 is greater than or equal to x2
print("\nGreater equal test:")
r = np.char.greater_equal(x1, x2)
print(r)
# Comparing the strings in x1 and x2 element-wise to check if x1 is less than x2
print("\nLess test:")
r = np.char.less(x1, x2)
print(r)
Sample Input:
['Hello' 'PHP' 'JS' 'examples' 'html'] ['Hello' 'php' 'Java' 'examples' 'html']
Sample Output:
Array1: ['Hello' 'PHP' 'JS' 'examples' 'html'] Array2: ['Hello' 'php' 'Java' 'examples' 'html'] Equal test: [ True False False True True] Not equal test: [False True True False False] Less equal test: [ True True True True True] Greater equal test: [ True False False True True] Less test: [False True True False False]
Explanation:
In the above code –
x1 = np.array(['Hello', 'PHP', 'JS', 'examples', 'html'], dtype=np.str): x1 is a NumPy array containing string data.
x2 = np.array(['Hello', 'php', 'Java', 'examples', 'html'], dtype=np.str): x2 is a NumPy array containing string data.
np.char.equal(x1, x2): This code compares element-wise if two arrays have the same strings at corresponding positions. It returns a boolean array of the same shape as inputs.
np.char.not_equal(x1, x2): This code is similar to equal function, but returns the opposite of equal function.
np.char.less_equal(x1, x2): This code returns a boolean array of the same shape as inputs, where each element is True if x1 is less than or equal to x2.
np.char.greater_equal(x1, x2): This code returns a boolean array of the same shape as inputs, where each element is True if x1 is greater than or equal to x2.
np.char.less(x1, x2): This code returns a boolean array of the same shape as inputs, where each element is True if x1 is less than x2.
Pictorial Presentation:
Python-Numpy Code Editor:
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