It's easier for folks to help you if you make your data available by
reproducible code.  You can do this using the dput() function.  So, for
example, you could share your hessianList with us using
     dput(hessianList)
and then including this code in your post

hessianList <- list(structure(c(0.003632559, -2.090772847, 0.2190629,
0.2190629
), .Dim = c(2L, 2L)), structure(c(0.004278991, 0.190723602, 0.04337005,
 0.04337005), .Dim = c(2L, 2L)), structure(c(0.01237827, 0.064522,
-0.01544811, -0.01544811), .Dim = c(2L, 2L)))

I'm not exactly sure what output you're looking for, but this may help ...

# perform the calculation straight out
sapply(seq(hessianList), function(i) sum(g[i]*hessianList[[i]]))

# or

# define a function to do the calculation on the provided vector and list
myfun <- function(V, L){
sapply(seq(L), function(i) sum(V[i]*L[[i]]))
 }
myfun(g, hessianList)

Jean


On Tue, Nov 5, 2013 at 11:40 AM, IZHAK shabsogh <ishaqbaba@yahoo.com> wrote:

>
>
> [[1]]
>              [,1]      [,2]
> [1,]  0.003632559 0.2190629
> [2,] -2.090772847 0.2190629
>
> [[2]]
>             [,1]       [,2]
> [1,] 0.004278991 0.04337005
> [2,] 0.190723602 0.04337005
>
> [[3]]
>            [,1]        [,2]
> [1,] 0.01237827 -0.01544811
> [2,] 0.06452200 -0.01544811
>
> g<-c(1,2,3)
>
> function(g,hessianList){
>    for(i in 1:3){
>          ft1<-g[2]*hessianList[[2]]
>          ft2<-sum(ft1)
>          ft2
>    }
> }
>
> can u please help me find out what is the problem with this code
>
> i want to multiply matrix 1-3 by a vector g and sum the result.
>
>
> thanks
>         [[alternative HTML version deleted]]
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>

	[[alternative HTML version deleted]]

