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# Tag Graphics [in x_,y_] is protected

Posted 9 years ago
 Hello, im trying to make som graphics with my Mathematica: f[x, y] := (1 - x^2 - y^2)/(1 + x^2 + y^2) a := -4 b := 4 c := -5 d := 5 F = Plot3D[ f[x, y], {x, a, b}, {y, c, d}, PlotLabel -> "3D.Diagramm", AspectRatio -> 1/GoldenRatio, AxesLabel -> {"x", "y", "z"}, PlotRange -> {{a, b}, {c, d}, {-1, 1}} ] Diagramm = ContourPlot[ f[x, y], {x, a, b}, {y, c, d}, PlotLabel -> "Höhendiagramm", ColorFunction -> "BlueGreenYellow", AspectRatio -> 1/GoldenRatio ] And as an answer i get: "Tag Graphics [in x,y] is protected" Can anyone help me? Thanks
 Stick a bit to the syntax and everything works: ClearAll[f, a, b, c, d] f[x_, y_] := (1 - x^2 - y^2)/(1 + x^2 + y^2) a = -4; b = 4; c = -5; d = 5 (* F= *)Plot3D[f[x, y], {x, a, b}, {y, c, d}, PlotLabel -> "3D.Diagramm", AspectRatio -> 1/GoldenRatio, AxesLabel -> {"x", "y", "z"}, PlotRange -> {{a, b}, {c, d}, {-1, 1}}] (* Diagramm= *)ContourPlot[f[x, y], {x, a, b}, {y, c, d}, PlotLabel -> "Höhendiagramm", ColorFunction -> "BlueGreenYellow", AspectRatio -> 1/GoldenRatio] the function definition was in error and the definition for a,b,and c needs a closing semicolon. d as the last one can go without a semicolon: CompoundExpression