R help - Jan 2010 - Retrieving an evaluated gradient value (UNCLASSIFIED)

Classification:  UNCLASSIFIED 
Caveats: NONE
 
Dear R users,

How can I retrieve an evaluated gradient value from "deriv" function
provided below? I want to retrieve b0 value. Appreciate your help.

Kyong

junk1<-deriv(~(1/b1)*k-b0/b1,"b0",c("k","b0","b1"),formal=T)

junk1(k=0,b0=-14.0236,b1=2.44031)
[1] 5.746647
attr(, "gradient"):
            b0 
[1,] -0.409784
 
Classification:  UNCLASSIFIED 
Caveats: NONE

	[[alternative HTML version deleted]]

Try this:

attr(junk1(k=0,b0=-14.0236,b1=2.44031), 'gradient')

On Thu, Jan 21, 2010 at 6:05 PM, Park, Kyong H Mr CIV USA AMC
<kyong.ho.park at us.army.mil> wrote:
> Classification: ?UNCLASSIFIED
> Caveats: NONE
>
> Dear R users,
>
> How can I retrieve an evaluated gradient value from "deriv"
function
> provided below? I want to retrieve b0 value. Appreciate your help.
>
> Kyong
>
>
junk1<-deriv(~(1/b1)*k-b0/b1,"b0",c("k","b0","b1"),formal=T)
>
> junk1(k=0,b0=-14.0236,b1=2.44031)
> [1] 5.746647
> attr(, "gradient"):
> ? ? ? ? ? ?b0
> [1,] -0.409784
>
> Classification: ?UNCLASSIFIED
> Caveats: NONE
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O