Thanks Karl-Dieter. I never tried R ... but you tease me to use it :-) Just now : sagemath cloud is on "database maintenance" (instability for some time) and I cannot try easily check your code. My interest for the median-center is because I am working on geometrical 2D code. I already coded something for n=3 (Toricelli point) and the generalized Fermat point (pondering distances to edges of triangle). I am using Forum Geometricorum papers and try to code, when paper is interesting. Dominique
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