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sortSolutions(List) -- sort the list of solutions

Synopsis

Description

The sorting is done lexicographically regarding each complex n-vector as real 2n-vector. The output format of track and solveSystem is respected.
The parts of coordinates are considered equal if within Tolerance
i1 : R = CC[x,y];
i2 : s = solveSystem {x^2+y^2-1, x*y}

o2 = {{{-1, -1.29331e-15-6.7522e-17*ii}}, {{4.45906e-16-2.30181e-16*ii, 1}},
     ------------------------------------------------------------------------
     {{-4.30618e-16+2.58804e-16*ii, -1}}, {{1, 1.29331e-15+6.7522e-17*ii}}}

o2 : List
i3 : sortSolutions s

o3 = {{{-1, -1.29331e-15-6.7522e-17*ii}}, {{-4.30618e-16+2.58804e-16*ii,
     ------------------------------------------------------------------------
     -1}}, {{4.45906e-16-2.30181e-16*ii, 1}}, {{1,
     ------------------------------------------------------------------------
     1.29331e-15+6.7522e-17*ii}}}

o3 : List