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Topic: How to solve very complex equations in matlab?
Replies: 13   Last Post: Jul 6, 2013 7:20 AM

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Torsten Hennig

Posts: 2,419
Registered: 12/6/04
Re: How to solve very complex equations in matlab?
Posted: Jul 4, 2013 2:49 AM
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> I have 4 functions each is a variable of x,y,z and
> a(j),b(j). Suppose j varies from 1 to 1000. So, with
> j, the function is varying. all the functions will be
> of the form f(x,y,z,a(j),b(j)). Let me take
> f1,f2,f3,f4 be the functions.
> If S1=sigma(f1*f2). sigma is over j varying from 1 to
> 1000.
> and S2=sigma(f1*f3), S3=sigma(f1*f4).
> now after summation S1,S2,S3 will be left with only
> x,y,z variables.
> I want to solve S1,S2,S3 to get x,y,z.
> Can someone help in doing this sigma of functions and
> solving. I already tried using 'solve' command. But I
> ended up errors. Any help is greatly appreciated.
> Thanks.
>
>
> Message was edited by: Srinath


What do you mean by
"I want to solve S1,S2,S3 to get x,y,z."
Do you want to prescribe fixed values for S1,S2 and S3
and then solve the three nonlinear equations
S1-sum(f1*f2)=0
S2-sum(f1*f3)=0
S3-sum(f1*f4)=0
for x,y and z ?
Then use MATLAB's "fsolve"-function.

Best wishes
Torsten.



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