numpy.absolute () in Python

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Parameters :

  arr:   [array_like]  Input array or object whose elements, we need to test. 

Return:

 An array with absolute value of each array. 

Code # 1: Work

# Python program explaining
# absolute () function

import numpy as np

arr1 = [ 1 , - 3 , 15 , - 466 ]

print ( "Absolute Value of arr1:" ,

np.absolute (arr1))

arr2 = [ 23 , - 56 ]

print ( " Absolute Value of arr2: " ,

np.absolute (arr2))

Output:

 Absolute Value of arr1: [1 3 15 466] Absolute Value of arr2: [23 56] 

Code # 2: Working with complex numbers

# Python program explained
# absolute () function

import numpy as np

a = 4 + 3j

print ( "Absolute (4 + 3j):" ,

np.absolute (a))

b = 16 + 13j

print ( "Absolute value (16 + 13j):" ,

np.absolute (b))

Output:

 Absolute (4 + 3j): 5.0 Absolute value ( 16 + 13j): 20.6155281281 

Code # 3: Graphical representation of numpy.absolute ()

# Python program explaining
# absolute () function

import numpy as np

import matplotlib.pyplot as plt

a = np.linspace (start = - 5 , stop = 5 ,

num = 6 , endpoint = True )

print ( "Graphical Representation:" ,

np.absolute (a))

plt.title ( "blue: with absolute red: without absolute " )

plt.plot (a, np.absolute (a) )

plt.plot (a, a, color = ’red’ )

plt.show ()

Output:

 Graphical Representation: [5. 3. 1. 1 . 3. 5.] 

Links:
https : //docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.absolute.html
,

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numpy.absolute () in Python absolute: Questions

How to get an absolute file path in Python

3 answers

izb By izb

Given a path such as "mydir/myfile.txt", how do I find the file"s absolute path relative to the current working directory in Python? E.g. on Windows, I might end up with:

"C:/example/cwd/mydir/myfile.txt"
877

Answer #1

>>> import os
>>> os.path.abspath("mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

Also works if it is already an absolute path:

>>> import os
>>> os.path.abspath("C:/example/cwd/mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

numpy.absolute () in Python absolute: Questions

How to check if a path is absolute path or relative path in a cross-platform way with Python?

3 answers

UNIX absolute path starts with "/", whereas Windows starts with alphabet "C:" or "". Does python have a standard function to check if a path is absolute or relative?

175

Answer #1

os.path.isabs returns True if the path is absolute, False if not. The documentation says it works in windows (I can confirm it works in Linux personally).

os.path.isabs(my_path)

numpy.absolute () in Python absolute: Questions

How to join absolute and relative urls?

3 answers

I have two urls:

url1 = "http://127.0.0.1/test1/test2/test3/test5.xml"
url2 = "../../test4/test6.xml"

How can I get an absolute url for url2?

139

Answer #1

You should use urlparse.urljoin :

>>> import urlparse
>>> urlparse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

With Python 3 (where urlparse is renamed to urllib.parse) you could use it as follow:

>>> import urllib.parse
>>> urllib.parse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

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