Minimum of a 3-d quadratic centered
at (1.0,1.0,1.0). Minimum is found
along a series of radials.

        x            y            z        minimum 
    1.138071     0.000000     0.804738     1.057191
    1.218959     0.193064     0.872678     0.715299
    1.247266     0.405261     0.927338     0.420134
    1.218959     0.621090     0.967371     0.192580
    1.134732     0.824431     0.991792     0.049044
    1.000000     1.000000     1.000000     0.000000
    0.824431     1.134732     0.991792     0.049044
    0.621090     1.218958     0.967371     0.192580
    0.405261     1.247266     0.927338     0.420135
    0.193064     1.218959     0.872678     0.715299
    0.000000     1.138071     0.804738     1.057191