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 Author Comment/Response RAyRAy 11/27/02 9:47pm MathID: 6102-07465-41960 License: L2996-4944 I was trying to define a function where i find the partial derivative, but I don't know how to set it up. This is what i have so far: Partial[x_, y_, z_] := {D[x, x], D[y, x], D[z, x]} the x,y,z are parametrized and can be in terms for t for x,y,z or u for x and v for y and u and v for z. I want to get the partial of x, y, z and return it to me as a vector {x,y,z}, and the partial in respect to whatever variable x will hold, not literally x. How would I get to this? Thanks, RAyRAy PS this function is 1 of a series of steps. What I am trying to do is: Given: x=u^2 y=v^2 z=u+2v and a point (1,1,3) for example I take the partial with respect to the parametric arguements u and v in this case. Partial u = {x1,y1,z1} Cross Partial v={x2,y2,z2} get the resulting vector = {x3,y3,z3} then return the equation of the tangent plane at the given point: x3(x-1) + y3(y-1) + z3(z-3) if u work out the problem it is: -2(x-1) -4(y-1) + 4(z-z) is this to much for a function or should I make a program/package to use? What is the best choice and how? Thanks a lot. RAyRAy URL: ,

 Subject (listing for 'Defining a Function') Author Date Posted Defining a Function RAyRAy 11/27/02 9:47pm Re: Defining a Function Forum Modera... 12/07/02 11:35am
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