Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2007
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2007

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

Search the Archive

Re: differentiate a function of a function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75106] Re: [mg75071] differentiate a function of a function
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Mon, 16 Apr 2007 20:25:48 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

f[x_,y_]:=Tan[t[x,y]+a[x,y]];

D[f[x,y],x]

Sec[a[x, y] + t[x, y]]^2*
  (Derivative[1, 0][a][x, y] + 
   Derivative[1, 0][t][x, y])


Bob Hanlon

---- kem <kemelmi at gmail.com> wrote: 
> Hi,
> 
> I was wondering how do I define a function in mathematica to be able
> to differentiate it etc, where some of the parameters of this function
> should be also a function. For example I want to be able to do the
> following operations:
> 
> 1) to say that f is a function: f(x,y) = Tan[t(x,y)+a(x,y)]
> 
> 2) take D[f,x] , such that also t(x,y) and a(x,y) will be also
> differentiated
> 
> 3) be able to substitute these into some equation like: f_x f_xy = 8
> 
> Thanks a lot
> 
> kem
> 
> 



  • Prev by Date: Re: Differentiation and evaluation of function
  • Next by Date: Publicon
  • Previous by thread: Re: differentiate a function of a function
  • Next by thread: Re: differentiate a function of a function