Calculates the Geothmetic Meandian as defined by xkcd.com/2435
M = geothmetic_meandian(X)
M = geothmetic_meandian(X, dim)
M is given by computating 3 parameters: mean(X), geomean(abs(X)) and
median(X), and iterating the computation until the 3 parameters converge.
The parameters are considered converged if their range < 1e-10 * range(X).
The final M is the mean of the converged parameters.
X: input array
dim: dimension on which calculations are applied (default = first non-singleton dimension)
Bramvg (2021). Geothmetic Meandian (https://www.mathworks.com/matlabcentral/fileexchange/88763-geothmetic-meandian), MATLAB Central File Exchange. Retrieved .
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