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jceresearch/NumpyGroupBy

Created December 29, 2014 13:23
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Phython - Numpy loop to group an array by certain key, supposed to be the faster way
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NumpyGroupBy
import numpy as np
data = np.arange(1, 7)
groups = np.array([0,0,1,2,2,1])
unique_groups = np.unique(groups)
sums = []
for group in unique_groups:
sums.append(data[groups == group].sum())
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