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MathGroup Archive 2006

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Re: LinearSolve and System Equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66039] Re: LinearSolve and System Equation
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 27 Apr 2006 04:36:31 -0400 (EDT)
  • References: <e2nd99$354$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Oumaimaa,
consider your expression:
Sum[(A[l,n] + B[l,n] ksi)Psimoins[n],{l,o,L}]== Sum[C[l,n] 
Psiplus[n],{l,0,L}]
If Psimoins and Psiplus do not depend on l, you simply have L+1 linear 
equation of the form c1 Psimoins[[i]] == c2 Psiplus[[i]] with constants 
c1 and c2, that can be solved at once.
Do we have some typo here???

Daniel


Oumaimaa wrote:
> Hello evrybody,
> 
> I'm doing some numerical results of a system of equations Sum[(A[l,n] + B[l,n] ksi)Psimoins[n],{l,o,L}]== Sum[C[l,n] Psiplus[n],{l,0,L}]
> 
> I want to find a symbolic result in this form:
> 
> Psimoins[n]=Psiplus[n]+Sum[M[n,n']Psiplus[n'],{n',0,n}]
> 
> So How to reduce the first form to the second. I'm in mess and I find some numerical result with initial values of Psiplus, A, B and C but not symbolic one.
> 
> Psiplus and Psimoins are matrices with indices n and l.
> A, B and C and functions of parametres n and l. 
> 
> So please can you help?!!!!
> 
> regards 
> Oumaimaa
> 


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