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numpy.ma.MaskedArray.max
method
MaskedArray.max(axis=None, out=None, fill_value=None, keepdims=<no value>)[source]- 
    
Return the maximum along a given axis.
Parameters: - 
           
axis : {None, int}, optional - 
           
Axis along which to operate. By default,
axisis None and the flattened input is used. - 
           
out : array_like, optional - 
           
Alternative output array in which to place the result. Must be of the same shape and buffer length as the expected output.
 - 
           
fill_value : {var}, optional - 
           
Value used to fill in the masked values. If None, use the output of maximum_fill_value().
 
Returns: - 
           
amax : array_like - 
           
New array holding the result. If
outwas specified,outis returned. 
See also
maximum_fill_value- Returns the maximum filling value for a given datatype.
 
 - 
           
 
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 https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.ma.MaskedArray.max.html