return position of a unique value in python array

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Liya
24 Sep 2017
1In [304]: array = np.array([1, 1, 2, 3, 2, 1, 2, 3])
2
3In [305]: np.unique(array)            # unique values in `array`
4Out[305]: array([1, 2, 3])
5
6In [306]: array == 1                  # retrieve a boolean mask where elements are equal to 1
7Out[306]: array([ True,  True, False, False, False,  True, False, False])
8
9In [307]: (array == 1).nonzero()[0]   # get the `True` indices for the operation above
10Out[307]: array([0, 1, 5])
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