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Topic: How to deal with complex nonlinear least square problem?
Replies: 4   Last Post: Nov 28, 2012 9:06 PM

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Torsten

Posts: 1,439
Registered: 11/8/10
Re: How to deal with complex nonlinear least square problem?
Posted: Nov 26, 2012 8:15 AM
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"flying" wrote in message <k8volo$2rm$1@newscl01ah.mathworks.com>...
> Hi all,
> I have ecountered a problem recently.It's something about 'complex nonlinear least square'. For instance,we want to minimize object function
> y = min|3+4i - x^2|^2 ,where i = sqrt(-1),x is a variable
> How can i get 'x' by using matlab function 'lsqnonlin'?
> If there are more variables,how can i figure this out?
>
> Anticipating your reply,thanks!
>
> Sincerely
> Frank
>


Hint:
|a+i*b|^2 = a^2 + b^2
for real numbers a and b.

Best wishes
Torsten.




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