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Please see the below question. This is what I need to implement in Mathematica.

Ques

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Does it answer your question?

f={{l x[1],0},{0,l(x[1]+x[2])}};
g[μ_]:=Sum[f[[μ,κ]]D[f[[ν,κ]],x[ν]],{ν,2},{κ,2}]
g[1]
Out[1]= l^2 x[1]
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  • $\begingroup$ Exactly. This is what I want. $\endgroup$ – Jasmine Sep 9 '20 at 2:37

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