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
>
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>
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