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June 9th, 2010, 10:35 PM  #1 
Newbie Joined: Jun 2010 Posts: 3 Thanks: 0  Directional Derivative/Gradient Vector
Hi all. I'd just like to check my answers for 2 questions in a previous exam paper, to which the answers weren't supplied h(x,y) = e^xy + 2x q1) Find the gradient vector of h(1, 0) I got 2i + j q2) In which 2 directions could I move from the point (1, 0, 3) along z = h(x, y) so as to remain at constant height. I got i  2j and 1 + 2j If someone could confirm those, that would be awesome! Thanks in advance Left of Zen 
June 10th, 2010, 04:01 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 17,919 Thanks: 1385 
Did you mean i + 2j rather than 1 + 2j?

June 10th, 2010, 06:06 PM  #3 
Newbie Joined: Jun 2010 Posts: 3 Thanks: 0  Re: Directional Derivative/Gradient Vector
Ah yes sorry that's a typo :s i + 2j is what I've got written here 
June 10th, 2010, 07:10 PM  #4 
Global Moderator Joined: Dec 2006 Posts: 17,919 Thanks: 1385 
Then I confirm your answers.

June 10th, 2010, 09:19 PM  #5 
Newbie Joined: Jun 2010 Posts: 3 Thanks: 0  Re: Directional Derivative/Gradient Vector
Ok awesome, thankyou very much for your help! Cheers Left of Zen 

Tags 
derivative or gradient, directional, vector 
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