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numpy.logspace() in Python
  • Last Updated : 23 Oct, 2020

The numpy.logspace() function returns number spaces evenly w.r.t interval on a log scale.
Syntax :

numpy.logspace(start,
               stop,
               num = 50,
               endpoint = True,
               base = 10.0,
               dtype = None)

Parameters :

-> start    : [float] start(base ** start) of interval range.
-> stop     : [float] end(base ** stop) of interval range
-> endpoint : [boolean, optional]If True, stop is the last sample. By default, True
-> num      : [int, optional] No. of samples to generate
-> base     : [float, optional] Base of log scale. By default, equals 10.0
-> dtype    : type of output array

Return :

-> ndarray


Code 1 : Explaining the use of logspace()




# Python Programming illustrating
# numpy.logspace method
  
import numpy as geek
  
# base = 11
print("B\n", geek.logspace(2.0, 3.0, num=5, base = 11))
  
# base = 10
print("B\n", geek.logspace(2.0, 3.0, num=5))
  
# base = 10, dtype = int
print("B\n", geek.logspace(2.0, 3.0, num=5, dtype = int))


Output :



B
 [  121.           220.36039471   401.31159963   730.8527479   1331.        ]
B
 [  100.           177.827941     316.22776602   562.34132519  1000.        ]
B
 [ 100  177  316  562 1000]

Code 2 : Graphical Representation of numpy.logspace() using matplotlib module – pylab




# Graphical Represenation of numpy.logspace()
import numpy as geek
import pylab as p
  
# Start = 0
# End = 2
# Samples to generate = 10
x1 = geek.logspace(0, 1, 10)
y1 = geek.zeros(10)
  
# Start = 0.1
# End = 1.5
# Samples to generate = 12
x2 = geek.logspace(0.1, 1.5, 12)
y2 = geek.zeros(12)
  
p.plot(x1, y1+0.05, 'o')
p.xlim(-0.2, 18)
p.ylim(-0.5, 1)
p.plot(x2, y2, 'x')


Output :

Note :
These NumPy-Python programs won’t run on onlineID, so run them on your systems to explore them

Similiar methods :

  • arange
  • linspace
  • This article is contributed by Mohit Gupta_OMG πŸ˜€. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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