Number of function evaluations:  37
Vertices of final 3-d simplex and
function values at the vertices:

  i       x[i]         y[i]         z[i]       function

  1     0.490676     0.605329     0.717563    -0.400000
  2     0.474908     0.597644     0.687565    -0.400000
  3     0.530209     0.590894     0.684828    -0.400000
  4     0.507350     0.633569     0.698853    -0.400000

True minimum is at (0.5,0.6,0.7)