[GitHub] huangzhiyuan commented on issue #13844: Sort operation does not support return index

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huangzhiyuan commented on issue #13844: Sort operation does not support return index
URL: https://github.com/apache/incubator-mxnet/issues/13844#issuecomment-453397904
 
 
   Maybe you can try [argsort()](https://mxnet.incubator.apache.org/api/python/ndarray/ndarray.html?highlight=sort#mxnet.ndarray.argsort):
   ```
   >>> x = nd.normal(shape=(3,4))
   >>> x
   [[-0.03716067 -0.48774993 -0.02261727  0.57461417]
    [ 1.4661262   0.6862904   0.35496104  1.0731696 ]
    [ 0.12017461 -0.9711102  -0.77569664 -0.7882176 ]]
   <NDArray 3x4 @cpu(0)>
   >>> x.sort()
   [[-0.48774993 -0.03716067 -0.02261727  0.57461417]
    [ 0.35496104  0.6862904   1.0731696   1.4661262 ]
    [-0.9711102  -0.7882176  -0.77569664  0.12017461]]
   <NDArray 3x4 @cpu(0)>
   >>> x.argsort()
   [[1. 0. 2. 3.]
    [2. 1. 3. 0.]
    [1. 3. 2. 0.]]
   
   <NDArray 3x4 @cpu(0)>
   >>> x.sort(0)
   [[-0.03716067 -0.9711102  -0.77569664 -0.7882176 ]
    [ 0.12017461 -0.48774993 -0.02261727  0.57461417]
    [ 1.4661262   0.6862904   0.35496104  1.0731696 ]]
   <NDArray 3x4 @cpu(0)>
   >>> x.argsort(0)
   [[0. 2. 2. 2.]
    [2. 0. 0. 0.]
    [1. 1. 1. 1.]]
   <NDArray 3x4 @cpu(0)>
   ```
   Hope it's useful for you :)

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