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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