M-estimator of location using self.norm and a current estimator of scale.
This iteratively finds a solution to
norm.psi((a-mu)/scale).sum() == 0
Parameters : | a : array
scale : array
norm : RobustNorm, optional
axis : int, optional
initial : array, optional
niter : int, optional
tol : float, optional
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Returns : | mu : array
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