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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: How can i figure this 'nonlinear least square problem'?
Replies: 6   Last Post: Jun 20, 2012 8:04 AM

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flying

Posts: 10
Registered: 4/13/12
Re: How can i figure this 'nonlinear least square problem'?
Posted: Jun 20, 2012 8:04 AM
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Torsten <Torsten.Hennig@umsicht.fraunhofer.de> wrote in message <e17f4874-5e02-4456-9154-ed7db21536b1@v9g2000yqm.googlegroups.com>...
> I think because A is complex, A = A1 + i*A2, the problem will not be
> linear in A.
> Note that multiplying out
> (A*M1*exp(j*theta*n)-M2)*conj( A*M1*exp(j*theta*n)-M2)
> and differentiating the term A*M1*conj(A*M1) with respect to A1, e.g.,
> gives (2*A1+A2^2)*M1*conj(M1),
> which is linear in A1, but not in A2 (reversed if you differentiate
> with respect to A2).
>
> Best wishes
> Torsten.

Thanks.

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