numpy.ma.power

ma.power(a, b, third=None)

Returns element-wise base array raised to power from second array.

This is the masked array version of numpy.power. For details see numpy.power.

也參考

numpy.power

Notes

The out argument to numpy.power is not supported, third has to be None.

Examples

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>>> import numpy as np
>>> import numpy.ma as ma
>>> x = [11.2, -3.973, 0.801, -1.41]
>>> mask = [0, 0, 0, 1]
>>> masked_x = ma.masked_array(x, mask)
>>> masked_x
masked_array(data=[11.2, -3.973, 0.801, --],
         mask=[False, False, False,  True],
   fill_value=1e+20)
>>> ma.power(masked_x, 2)
masked_array(data=[125.43999999999998, 15.784728999999999,
               0.6416010000000001, --],
         mask=[False, False, False,  True],
   fill_value=1e+20)
>>> y = [-0.5, 2, 0, 17]
>>> masked_y = ma.masked_array(y, mask)
>>> masked_y
masked_array(data=[-0.5, 2.0, 0.0, --],
         mask=[False, False, False,  True],
   fill_value=1e+20)
>>> ma.power(masked_x, masked_y)
masked_array(data=[0.2988071523335984, 15.784728999999999, 1.0, --],
         mask=[False, False, False,  True],
   fill_value=1e+20)

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