NumPy: Convert cartesian coordinates to polar coordinates
NumPy: Random Exercise-14 with Solution
Write a NumPy program to convert cartesian coordinates to polar coordinates of a random 10x2 matrix representing cartesian coordinates.
Sample Solution:-
Python Code:
import numpy as np
z= np.random.random((10,2))
x,y = z[:,0], z[:,1]
r = np.sqrt(x**2+y**2)
t = np.arctan2(y,x)
print(r)
print(t)
Sample Output:
[ 0.46197382 0.07034582 0.89015703 1.06227375 1.29780158 0.32823362 0.99823096 0.74005334 0.38023205 0.62537423] [ 1.05405564 1.09799508 0.75642993 0.97273388 0.86502465 0.88995172 0.3019899 1.05539822 0.91697477 1.22828465]
Python-Numpy Code Editor:
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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