I am reopening an issue which was previously demoted to a question but turns out to be a shortcoming of the pythonnet API. As the discussion#1772 shows, there is no way to successfully call the function numpy.gradient(f, *varargs, axis=None, edge_order=1) as documented here:https://numpy.org/doc/stable/reference/generated/numpy.gradient.html

Here is an example in python

>>>importnumpyasnp>>>dx=4.0>>>dy=5.0>>>zX=[[1,2,3],[4,5,6],[8,9,0]]>>>np.gradient(zX,dx,dy)[array([[0.75 ,0.75 ,0.75 ],       [0.875,0.875,-0.375],       [1.   ,1.   ,-1.5  ]]),array([[0.2,0.2,0.2],       [0.2,0.2,0.2],       [0.2,-0.8,-1.8]])]>>>

Various ways to call the function have been tried in#1772 but none work. This should be considered a bug.