# spacepy.toolbox.geomspace

`spacepy.toolbox.``geomspace`(start, ratio=None, stop=False, num=50)

  Returns geometrically spaced numbers.

  Parameters: | start : float The starting value of the sequence. ratio : float (optional) The ratio between subsequent points stop : float (optional) End value, if this is selected num is overridden num : int (optional) Number of samples to generate. Default is 50.
  Returns: | seq : array geometrically spaced sequence

  See also

  `linspace`, `logspace`

  Examples

  To get a geometric progression between 0.01 and 3 in 10 steps

      >>> import spacepy.toolbox as tb
      >>> tb.geomspace(0.01, stop=3, num=10)
      [0.01,
       0.018846716378431192,
       0.035519871824902655,
       0.066943295008216955,
       0.12616612944575134,
       0.23778172582285118,
       0.44814047465571644,
       0.84459764235318191,
       1.5917892219322083,
       2.9999999999999996]

  To get a geometric progression with a specified ratio, say 10

      >>> import spacepy.toolbox as tb
      >>> tb.geomspace(0.01, ratio=10, num=5)
      [0.01, 0.10000000000000001, 1.0, 10.0, 100.0]