When looking at partial derivatives at a specific point and use the limit as h approaches 0 how can you determine what h is? For example, I am given f in respect to w (10,25) I know I need to use f(w+h, T) - f(w,T) all over h. I can find all the values to plug in except for h.

Question

turingtest · Answer

you are supposed to eliminate h
that is the goal

turingtest · Answer

in the formula for the derivative h tends to zero, and is in the denominator.
hence, if you can't eliminate it you get an undefined derivative at that point

experimentx · Answer

choose small as you like, as you can think of.

anonymous · Answer

well i end up getting f(10+h , 25) -15 over h and if i can find h i can find the exact solution.

experimentx · Answer

f(w,t) must be some kind of function right??

anonymous · Answer

I think i got it! I just need to choose my h to be the smallest approaching value for w. I did that and got the right answer.

experimentx · Answer

okay congratz.

anonymous · Answer

Thanks! :)

turingtest · Answer

give the man a medal if you like his answer :)

experimentx · Answer

hahah .. it's all right. learning is more important than anything. LOL

anonymous · Answer

how do you give medals? i have never used this before.

anonymous · Answer

mk i got it haha :)