# How to create a list of uniformly spaced numbers using a logarithmic scale with python ?

Published: October 10, 2019

Example of how to create a list of uniformly spaced numbers using a logarithmic scale with python:

### Using the numpy function logspace

Let's create a list of 100 uniformly spaced numbers (between \$10^{0.1}\$ et \$10^{3}\$) using a logarithmic scale

````>>> import numpy as np`
`>>> l = np.logspace(0.1, 3, 100, endpoint=True)`
`>>> l`
`array([    1.25892541,     1.34676844,     1.44074081,     1.54127022,`
`           1.64881419,     1.76386217,     1.88693776,     2.0186011 ,`
`           2.1594514 ,     2.3101297 ,     2.47132176,     2.64376119,`
`           2.82823278,     3.0255761 ,     3.23668929,     3.46253315,`
`           3.70413553,     3.96259601,     4.23909088,     4.53487851,`
`           4.85130507,     5.18981068,     5.55193591,     5.93932887,`
`           6.35375264,     6.79709332,     7.27136862,     7.77873705,`
`           8.32150772,     8.90215085,     9.52330906,    10.18780932,`
`          10.89867589,    11.65914401,    12.47267471,    13.34297048,`
`          14.27399218,    15.26997703,    16.33545792,    17.475284  ,`
`          18.69464281,    19.99908384,    21.3945438 ,    22.88737364,`
`          24.48436747,    26.19279345,    28.02042689,    29.97558564,`
`          32.06716793,    34.30469286,    36.69834378,    39.25901454,`
`          41.99835916,    44.92884483,    48.06380863,    51.41751828,`
`          55.00523702,    58.84329312,    62.94915417,    67.34150658,`
`          72.04034062,    77.06704142,    82.44448627,    88.19714876,`
`          94.35121014,   100.9346785 ,   107.97751623,   115.51177638,`
`         123.57174852,   132.19411485,   141.41811708,   151.28573508,`
`         161.84187792,   173.13458823,   185.21526088,   198.1388769 ,`
`         211.96425366,   226.75431259,   242.57636554,   259.50242114,`
`         277.60951248,   296.98004774,   317.70218523,   339.87023462,`
`         363.58508612,   388.9546697 ,   416.09444628,   445.12793318,`
`         476.1872663 ,   509.41380148,   544.95875783,   582.98390597,`
`         623.66230422,   667.17908629,   713.7323038 ,   763.53382765,`
`         816.81031231,   873.8042273 ,   934.77496078,  1000.        ])`
```

### Plot with matplotlib

````import numpy as np`
`import matplotlib.pyplot as plt`

`l = np.logspace(0.1, 3, 100, endpoint=True)`

`plt.scatter([i for i in range(l.shape[0])], l)`

`plt.title(u'List of logarithmically spaced numbers with python')`
`plt.grid()`

`plt.savefig("log_scale_list_numbers.png",bbox_inches='tight')   `
`plt.show()`
```

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