Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2008

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

Search the Archive

Re: How to introduce a Functional with the results with Solve command?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89280] Re: How to introduce a Functional with the results with Solve command?
  • From: dh <dh at metrohm.ch>
  • Date: Tue, 3 Jun 2008 06:45:20 -0400 (EDT)
  • References: <g22tpq$il1$1@smc.vnet.net>


Hi,

it is not too clear to me what you want to do, I will try to guess.

You have a function sol4[rom_] of a parameter rom. Note that rom is a 

dummy parameter, therefore it can not depend on x1. But you may e.g. write:

sol4[Sqrt[x1]]

Only of this we can take the derivative relative to x1. E.g.:

D[sol4[Sqrt[x1]],x1]

Note also, there is a more formal way using Dt. This will give the total 

derivative with symbolic drom/dx1, but this is perhaps not what you want.

hope this helps, Daniel



Kaibin Fu wrote:

> I get the expression of urm which is a function of rom. 

>  

> sol3=Solve[sol2 == 0, urm]; 

> sol4[rom_] = sol3[[1]][[1]][[2]];

> Because rom is a function of x1, I want to take the derivative of the following functional with respect of x1. 

> sol5[x1_]=3*rom -sol4[rom]

> How should I do it?

> If convenient, please send an email to

> kaibinfu at gmail.com

> thanks.

> 





-- 



Daniel Huber

Metrohm Ltd.

Oberdorfstr. 68

CH-9100 Herisau

Tel. +41 71 353 8585, Fax +41 71 353 8907

E-Mail:<mailto:dh at metrohm.com>

Internet:<http://www.metrohm.com>




  • Prev by Date: Re: Log(ln) Function + 2 Parameters + Greater
  • Next by Date: Re: Log(ln) Function + 2 Parameters + Greater
  • Previous by thread: Re: How to introduce a Functional with the results with Solve command?
  • Next by thread: Log(ln) Function + 2 Parameters + Greater