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5.11.10  Barycenter of complex numbers: barycenter

barycenter takes as argument two lists of the same size (resp. a matrix with two columns):

barycenter returns the barycenter point of the points Aj weighted by the real coefficients αj. If ∑αj = 0, barycenter returns an error.
Warning To have a complex number in the output, the input must be:
affix(barycenter(...,...)) because barycenter(...,...) returns a point, not a complex number.
Input:

affix(barycenter([1+i,1-i],[1,1]))

or:

affix(barycenter([[1+i,1],[1-i,1]]))

Output:

i

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