Hi
Those have zero and dividing by zero produces NA
> (dg0%*%t(dx0))
[,1] [,2]
[1,] 0 -0.75
[2,] 0 0.50> (dx0%*%t(dg0))
[,1] [,2]
[1,] 0.00 0.0
[2,] -0.75 0.5>
NAs propagates in further computation.
Regards
Petr
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of IZHAK shabsogh
> Sent: Monday, January 13, 2014 8:10 AM
> To: r-help at r-project.org
> Subject: [R] computation
>
> kindly help me fine what is the mistake with following: my aim is to
> compute those steps and obtain a vector with values (3,5) but i am
> geting (NAN,NAN)
>
> Q<-matrix(c(5,-3,-3,2),2,2)
> b<-rbind(0,1)
> H0<-diag(2)
> x0<-rbind(0,0)
> d0<-b
> g0<--b
> a0<--(t(g0)%*%d0)/(t(d0)%*%Q%*%d0)
> x1<-x0+a0[,1]*d0
> dx0<-x1-x0
> g1<-Q%*%x1-b
> dg0<-g1-g0
> exp1<-(t(dg0)%*%H0%*%dg0)/(t(dg0)%*%dx0)
> exp2<-(dx0%*%t(dx0))/(dg0%*%t(dx0))
> exp3<-(dx0%*%t(dg0)%*%H0 +H0%*%dg0%*%t(dx0))/(dx0%*%t(dg0))
> H1<-H0+(1+exp1[,1])*exp2-exp3
> d1<--H1%*%g1
> a2<-(t(g1)%*%d1)/(t(d1)%*%Q%*%d1)
> x2<-x1+a2[,1]*d1
>
> [[alternative HTML version deleted]]
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