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Matrices and ODE 0 2 (2/13/2013 9:48:44 AM) comp.soft-sys.math.mathematica I'm using NDSolve to solve a'[t]=f(a[t]), where a is a square matrix. On the right-hand side, how do I access elements of a[t]? a[t][[i,j]], doesn't work, and I can't guess the right syntax. ((0,0,1,0).a[t].... snowyphile

Bug in Spherical Plot 3D, Mathematica version 7 1 37 (6/8/2012 7:42:28 AM) comp.soft-sys.math.mathematica The following should yield a hemisphere: - 2 Pi/5 \le \[Phi] \le 3 Pi/ 5. SphericalPlot3D[UnitStep[{Sin[\[Phi]] Sin[\[Theta]], Cos[\[Phi]] Sin[\ [Theta]], Cos[\[Theta]]}.{Cos[2 Pi/5], Sin[2 Pi/5], 0}... snowyphile

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Bug in Spherical Plot 3D, Mathematica version 7 1 37 (6/8/2012 7:42:28 AM) comp.soft-sys.math.mathematica The following should yield a hemisphere: - 2 Pi/5 \le \[Phi] \le 3 Pi/ 5. SphericalPlot3D[UnitStep[{Sin[\[Phi]] Sin[\[Theta]], Cos[\[Phi]] Sin[\ [Theta]], Cos[\[Theta]]}.{Cos[2 Pi/5], Sin[2 Pi/5], 0}... dtorney (3)

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Bug in Spherical Plot 3D, Mathematica version 7 1 37 (6/8/2012 7:42:28 AM) comp.soft-sys.math.mathematica The following should yield a hemisphere: - 2 Pi/5 \le \[Phi] \le 3 Pi/ 5. SphericalPlot3D[UnitStep[{Sin[\[Phi]] Sin[\[Theta]], Cos[\[Phi]] Sin[\ [Theta]], Cos[\[Theta]]}.{Cos[2 Pi/5], Sin[2 Pi/5], 0}... dtorney (3)