R help - Jun 2013 - How can we access an element in a structure

Hi,

  I have a structure, which is the result of a function
  How can I access the elements in the gradient?
> dput(test1)
structure(-1.17782911684913, gradient = structure(c(-0.0571065371783791,
-0.144708170683529), .Dim = 1:2, .Dimnames = list(NULL, c("x1",
"x2"))))
> test1[[1]]
[1] -1.177829
> test1
[1] -1.177829
attr(,"gradient")
              x1         x2
[1,] -0.05710654 -0.1447082
> test1["gradient"]
[1] NA


  Thanks,

Miao

	[[alternative HTML version deleted]]

Hi Miao,

Try

attributes(test1)[[1]]

HTH,
Jorge.-



On Tue, Jun 11, 2013 at 3:49 PM, jpm miao <miaojpm@gmail.com> wrote:
> Hi,
>
>   I have a structure, which is the result of a function
>   How can I access the elements in the gradient?
>
> > dput(test1)
> structure(-1.17782911684913, gradient = structure(c(-0.0571065371783791,
> -0.144708170683529), .Dim = 1:2, .Dimnames = list(NULL, c("x1",
> "x2"))))
> > test1[[1]]
> [1] -1.177829
> > test1
> [1] -1.177829
> attr(,"gradient")
>               x1         x2
> [1,] -0.05710654 -0.1447082
> > test1["gradient"]
> [1] NA
>
>
>   Thanks,
>
> Miao
>
>         [[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]]

Hello,

Already asked and answered here:
http://stackoverflow.com/questions/4034436/extract-the-gradient-from-the-deriv-command

Regards,
Pascal



2013/6/11 jpm miao <miaojpm@gmail.com>
> Hi,
>
>   I have a structure, which is the result of a function
>   How can I access the elements in the gradient?
>
> > dput(test1)
> structure(-1.17782911684913, gradient = structure(c(-0.0571065371783791,
> -0.144708170683529), .Dim = 1:2, .Dimnames = list(NULL, c("x1",
> "x2"))))
> > test1[[1]]
> [1] -1.177829
> > test1
> [1] -1.177829
> attr(,"gradient")
>               x1         x2
> [1,] -0.05710654 -0.1447082
> > test1["gradient"]
> [1] NA
>
>
>   Thanks,
>
> Miao
>
>         [[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]]