From maechler at stat.math.ethz.ch  Fri Dec 14 18:13:03 2007
From: maechler at stat.math.ethz.ch (Martin Maechler)
Date: Fri, 14 Dec 2007 18:13:03 +0100
Subject: [Rd] Do not misuse R-devel {was "Quadratic Programming"}
In-Reply-To: <D0B620C63B10AC41BF1DBD4184C9C50003555912@S00MAIL003.ads.sfa.se>
References: <D0B620C63B10AC41BF1DBD4184C9C50003555912@S00MAIL003.ads.sfa.se>
Message-ID: <18274.47519.474678.439531@stat.math.ethz.ch>

Please use the R-help mailing for such *Questions*.

R-devel has a very different purpose.
Probably you should also read the posting guide,
--> http://www.r-project.org/posting-guide.html

Regards,
Martin Maechler, ETH Zurich

>>>>> "dGdVS" == de Gosson de Varennes Serge (4100) <serge.de.gosson.de.varennes at forsakringskassan.se>
>>>>>     on Fri, 14 Dec 2007 09:15:26 +0100 writes:

    dGdVS> Hi all!  I have a little question concerning
    dGdVS> quadprog. To make it simple I'll start by stating the
    dGdVS> problem:

    dGdVS> I want to minimize

    dGdVS> 		h(d,delta)=0.5d^T B d +nabla(f(x))^T d
    dGdVS> +rho*delta^2

    dGdVS> With respect to d\in R^n and delta \in R. I obviously
    dGdVS> have constraints (depending on both d and delta).

    dGdVS> Solve.QP does give me a good result for d but I
    dGdVS> cannot obtain anything for delta. Simce dim(Dmat)=n
    dGdVS> and sol<-rep(0,n) it isn't particularly surprising.
    dGdVS> To set a diagonal matrix

    dGdVS> 		(B 0 ) Amat= (0 rho )

    dGdVS> Is a crapy idea. Does anyone have an idea?

    dGdVS> Yours,

    dGdVS> Serge

    dGdVS> "Beatus qui prodest quibus potest" - (Lycklig ?r
    dGdVS> den som hj?lper andra)

    dGdVS> Serge de Gosson de Varennes F?rs?kringskassan
    dGdVS> Swedish Social Insurance Agency +46-76 11 40 799
    dGdVS> serge.de.gosson.de.varennes at forsakringskassan.se





    dGdVS> 	[[alternative HTML version deleted]]

    dGdVS> ______________________________________________
    dGdVS> R-devel at r-project.org mailing list
    dGdVS> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] Do not misuse R-devel {was "Quadratic Programming"}
Martin Maechler