spacepy.toolbox.geomspace

spacepy.toolbox.geomspace(start, ratio=None, stop=False, num=50)[source]

Returns geometrically spaced numbers.

Parameters
startfloat

The starting value of the sequence.

ratiofloat (optional)

The ratio between subsequent points

stopfloat (optional)

End value, if this is selected num is overridden

numint (optional)

Number of samples to generate. Default is 50.

Returns
seqarray

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]