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numpy.ma.diag
ma.diag(v, k=0)[source]- 
    
Extract a diagonal or construct a diagonal array.
This function is the equivalent of
numpy.diagthat takes masked values into account, seenumpy.diagfor details.See also
numpy.diag- 
       
Equivalent function for ndarrays.
 
 
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Licensed under the 3-clause BSD License.
 https://numpy.org/doc/1.20/reference/generated/numpy.ma.diag.html