what functionalDerivative returns is a 1*1 symfun, not a vector

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Tony Cheng
Tony Cheng 2019-7-15
回答： Stephan 2019-7-15
Hi guys,
I am trying the codes
syms u(x) v(x)
H = u^2*diff(v,x)+v*diff(u,x,x);
D = functionalDerivative(H,[u v])
at https://au.mathworks.com/help/symbolic/functionalderivative.html
Actually, the D returned by functionalDerivative is a 1*1 symfun, but a 1 * 2 vector of symbolic functions.
So how to return a 1*2 vector?
Many thanks.

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采纳的回答

Stephan
Stephan 2019-7-15
syms u(x) v(x)
H = u^2*diff(v,x)+v*diff(u,x,x);
D(1) = functionalDerivative(H,u)
D(2) = functionalDerivative(H,v)

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