MathGroup Archive 2013

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Matrices and ODE


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].(0,0,1,0) works but is not compact.)



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