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: <email@example.com>
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[][][]; > 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>