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Directional Derivative



Can anyone explain what question 5 is actually asking for?

I've worked out ∇f(0,2)=2i+j\nabla f(0,2)=2i+j

and Duf=(2,1)⋅uD_u f=(2,1)\cdot u

The question says the derivative = 0 but is this the directional derivative or what? Does it want me to find a direction u?
Reply 1
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around
13
Yeah, you need to find a direction. Remember it has to be a unit vector.
Reply 2
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TheEd
OP
around
Yeah, you need to find a direction. Remember it has to be a unit vector.


But how would I do that. Is the question saying Duf=0D_u f=0 ?

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