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 Author Comment/Response Ginno Lipst 10/05/10 7:56pm Thanks. I then define a function G[a_, b_] := FindMaximum[{Max[Abs[x + y], Abs[x - y], Abs[(1 + a) x + (b - 2) y]], 1 >= x >= -1 && 1 >= y >= -1 && (x == 1 || -x == 1 || y == 1 || -y == 1 || a*x + b y == 1 || a*x + b y == -1)}, {x, y}] I am wondering why Mathematica can not compute G[0, 4] or Plot3D[{G[a, b]}, {a, -5, 5}, {y, -5, 5}]. How to get the graph of the function G by Mathematica? URL: ,

 Subject (listing for 'FindMaximum in Mathematica') Author Date Posted FindMaximum in Mathematica Ginno Lipst 09/25/10 4:08pm Re: FindMaximum in Mathematica Forum Modera... 09/26/10 7:12pm Re: FindMaximum in Mathematica Forum Modera... 09/26/10 7:29pm Re: FindMaximum in Mathematica Ginno Lipst 10/05/10 7:56pm
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