Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Why does Derivative fail in this case?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96557] Why does Derivative fail in this case?
  • From: Aaron Fude <aaronfude at gmail.com>
  • Date: Mon, 16 Feb 2009 06:58:26 -0500 (EST)

Hi,

This example is self-explanatory:

f[x_, y_] := x y
g = f[##]*f[##] &;
h = Derivative[1, 0][g];
g[x, y]
h[x, y]

I should expect that h[x, y] is 2 x y^2, but instead it is zero. How
come?

Version 6.0

Many thanks in advance,

Aaron


  • Prev by Date: Re: NDSolve - Nice function but stiffness-problem
  • Next by Date: Re: Length of a held expression
  • Previous by thread: Re: Re: optimization
  • Next by thread: Re: Why does Derivative fail in this case?