1. Hello,

The y = a 0 + a1 x1 + a2 x2 + a3 x3.

So let e.g. y = 5 + 4x1 + 6x2 + 2x3 and ai = ∂y/∂xi

Can someone please axplain how to yield ai ?

I know it's a very, very simple task, but I can't remember it exactly since it's been a long time since I've studied derivations.

Thanks.

2.

3. To do a partial derivative, treat the variable on the bottom as a variable and all other variables as constants and then do a normal derivative. And since this is a polynomial the only rule you need is that .

4. Thank you very much. To interpret the derivations results, the result shows how much will y vary if the xi is varied and all other variables are kept constant, right?

5. Yeah. One way to interpret is how much does vary in the direction.

 Bookmarks
##### Bookmarks
 Posting Permissions
 You may not post new threads You may not post replies You may not post attachments You may not edit your posts   BB code is On Smilies are On [IMG] code is On [VIDEO] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are On Terms of Use Agreement