How to process numpy.median Python data

This time I will bring you PythonHow to process numpy.median data, what are the precautions for Python data processing numpy.median, the following is a practical case, let’s take a look .

The function of median under the numpy module is:

Calculate the median along the specified axis

Return the median of the array elements Median

The function interface is:

median(a, 
axis=None, 
out=None,
overwrite_input=False, 
keepdims=False)

The parameters are:

a: Input array;

axis: Calculate the median on which axis, for example, the input is a two-dimensional array , then axis=0 corresponds to the row and axis=1 corresponds to the column;

out: is used to place the array after calculating the median. It must have the same shape and buffer length as the expected output;

overwrite_input: A bool parameter, defaulting to Flase. If it is True, it will be calculated directly in the array memory, which means that the original array cannot be saved after calculation, but the advantage is to save memory resources, and the opposite is true for False;

keepdims: a bool Type parameter, defaults to False. If it is True, the axis for calculating the median will be retained in the result;

>>> a = np.array([[10, 7, 4], [3, 2, 1]])
>>> a
array([[10, 7, 4],
    [ 3, 2, 1]])
>>> np.median(a)
3.5
>>> np.median(a, axis=0)
array([ 6.5, 4.5, 2.5])
>>> np.median(a, axis=1)
array([ 7., 2.])
>>> m = np.median(a, axis=0)
>>> out = np.zeros_like(m)
>>> np.median(a, axis=0, out=m)
array([ 6.5, 4.5, 2.5])
>>> m
array([ 6.5, 4.5, 2.5])
>>> b = a.copy()
>>> np.median(b, axis=1, overwrite_input=True)
array([ 7., 2.])
>>> assert not np.all(a==b)
>>> b = a.copy()
>>> np.median(b, axis=None, overwrite_input=True)
3.5

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