larray.Array.growth_rate¶
-
Array.
growth_rate
(axis=-1, d=1, label='upper') → larray.core.array.Array[source]¶ Calculates the growth along a given axis.
Roughly equivalent to a.diff(axis, d, label) / a[axis.i[:-d]]
Parameters: - axis : int, str, Group or Axis, optional
Axis or group along which the difference is taken. Defaults to the last axis.
- d : int, optional
Periods to shift for forming difference. Defaults to 1.
- label : {‘lower’, ‘upper’}, optional
The new labels in axis will have the labels of either the array being subtracted (‘lower’) or the array it is subtracted from (‘upper’). Defaults to ‘upper’.
Returns: - Array
Examples
>>> data = [[4, 5, 4, 0, 0, 4, 6], [2, 4, 3, 6, 6, 3, 9]] >>> a = Array(data, "sex=M,F; year=2015..2021") >>> a sex\year 2015 2016 2017 2018 2019 2020 2021 M 4 5 4 0 0 4 6 F 2 4 3 6 6 3 9 >>> a.growth_rate() sex\year 2016 2017 2018 2019 2020 2021 M 0.25 -0.2 -1.0 0.0 inf 0.5 F 1.0 -0.25 1.0 0.0 -0.5 2.0 >>> a.growth_rate(label='lower') sex\year 2015 2016 2017 2018 2019 2020 M 0.25 -0.2 -1.0 0.0 inf 0.5 F 1.0 -0.25 1.0 0.0 -0.5 2.0 >>> a.growth_rate(d=2) sex\year 2017 2018 2019 2020 2021 M 0.0 -1.0 -1.0 inf inf F 0.5 0.5 1.0 -0.5 0.5 >>> a.growth_rate('sex') sex\year 2015 2016 2017 2018 2019 2020 2021 F -0.5 -0.2 -0.25 inf inf -0.25 0.5 >>> a.growth_rate(a.year[2017:]) sex\year 2018 2019 2020 2021 M -1.0 0.0 inf 0.5 F 1.0 0.0 -0.5 2.0