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dtorney (3) 2 Articles, 1 Replies, 3 Points
Stats Updating... 12/12/2013 8:27:18 AM

Since 6/8/2012 7:46:30 AM, dtorney has written 2 articles and participated in 1 conversations.
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dtorney

dtorney's articles:
 Items(2) /1 Matrices and ODE 0 5 (2/13/2013 9:48:44 AM) comp.soft-sys.math.mathematicaI'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 51 (6/8/2012 7:42:28 AM) comp.soft-sys.math.mathematicaThe 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

dtorney's replies:
 Items(1) /1 Bug in Spherical Plot 3D, Mathematica version 7 1 51 (6/8/2012 7:42:28 AM) comp.soft-sys.math.mathematicaThe 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)

dtorney is following:
 Items(1) /1 Bug in Spherical Plot 3D, Mathematica version 7 1 51 (6/8/2012 7:42:28 AM) comp.soft-sys.math.mathematicaThe 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)