[R] Minimization Problem

[David Winsemius]

I'm not sure that it comes across as a "matrix problem" in the sense  
of involving matrix algebra, but it's also possible that I don't  
understand what you are saying. Seems that an appropriate application  
of:

?abs
?max
?sapply
?which.min

... ought to do the trick. If you were hoping for the name of the  
column vector, then may also need to look at:

?names

-- 
David Winsemius

On Jan 18, 2009, at 7:17 AM, glenn wrote:

> Dear All,
>
> Could someone give me some pointers (just a guide as to what  
> functions I
> need to look at would be fine)
> as to how I go about this simple problem please;
>
> The problem looks like this;
>
> Choose x1 to x4 such that you minimize the MAXIMUM ABSOLUTE value  
> returned
> in the vector result of this matrix problem;
>
> [x1,x2,x3,x4].[ -0.38   -0.52     0.68    -0.29 ]
>              [ -0.39   -0.42    -0.12     0.49 ]
>              [ -0.40   -0.20    -0.45     0.26 ]
>              [ -0.39    0.03    -0.39    -0.36 ]
>
>
> I hope the formatting comes out ok , I did this on a Mac !
>
> Glenn
>
> 	[[alternative HTML version deleted]]
>
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