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I have a vector valued function $U(x,y)=\Big(u_{1}(x,y),u_{2}(x,y)\Big)$. I want to find $\|\nabla U\|_{L_{2}(0,1)}$, but i could not figure how can do it. Do you have any idea?

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    Do you mean divergence of $U$? I don't know how you take the gradient of a vector-valued function.2012-08-04
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    as i know gradient(U(x,y))=jacobi($u_{1},u_{2}$)2012-08-04
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    @Brhn What is the context of the problem? Is there any more information you can provide?2012-08-04

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