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Hi, im solving this problem and everything went well until i went and solved the position p(5,3) and i got the answer of 0. However, the solution guide lists the solution as 150 which is pointed at in blue. I don't understand this since the pixel at the location is 0, meaning we don't have to calculate the solution however the solution says otherwise. Thanks for your time.

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The solution provided is correct. Here is why.

To compute the derivative at index(3,5)

d(3,5) = value_at(4,5) - value_at(2,5)
d(3,5) = 150 - 0 
d(3,5) = 150

Hence the solution provided there is correct. Hope this helps :)

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