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Re: LeastSquares using LinearProgramming?


Hi,

you question is

"Is ||m.x-b||^2 linear."

and it is not.
Linear programming usual search the simplex build up
from the constrains and searches only the corners
of that simplex. Because for a linear problem c.x the
optimal value *must* be on the corners of the simplex of the
constrains. For a quadratic (that's why it is called "least squares")
this is not true.

Regards
   Jens




Gareth Russell wrote:
> Hi,
> 
> Is it possible to specify a least-squares minimization through the 
> LinearProgramming function? In other words, exactly the same as 
> LeastSquares, with the extra constraint that all x>=0?
> 
> Presumably it comes down to specifying the input c correctly in the 
> LinearProgramming function. But I can't see how to do that such that 
> what is being minimized is the standard least-squares function 
> ||m.x-b||^2
> 
> Thanks,
> 
> Gareth


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