First, to return several values from your function 'parameter', you can use
a list:

parameter <- function (...) {
...
list(alpha=alpha,beta=beta,para=para,parab=parab)
}


Then, you may use:

sapply(split(variable,list(a,b)), parameter)

(tapply also works but return a matrix of lists)


Christophe Pallier


On 6/19/07, livia <yn19832@msn.com> wrote:
>
>
> Hi, I am trying to write a function with the following codes and I would
> like
> it to return the values for "alpha
> beta para parab " seperately. Then I would like to use this funstion for
> "variable" with factor "a" and "b". But the result turns out to be a
> matrix
> with element like "Numeric,2" ... I guess they are just the values for
> "parab", and we can not even see the two parameters in parab.
>
>
> parameter <- function(v) {
> v1 <- v[v>mean(v)+0.5*sd(v)]
> v2 <- v[v<mean(v)-0.5*sd(v)]
> alpha=min(v1)
> beta=max(v2)
> para <- fitgpd(v1,alpha, method="pwmu")$param
> parab <- fitgpd((-v2), (-beta), method="pwmu")$param
> v1.fit <- qgpd(ppoints(v1, a=0.5), alpha, para[1], para[2])
> v2.fit <- qgpd(ppoints((-v2), a=0.5), (-beta), para[1], para[2])
> alpha
> beta
> para
> parab
>
> }
>
> tapply(variable, list(a, b),parameter)
>
>
> I would be grateful if anyone can give me some advice. Many thanks
> --
> View this message in context:
> http://www.nabble.com/Function--return-value-tf3947134.html#a11197159
> Sent from the R help mailing list archive at Nabble.com.
>
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Christophe Pallier (http://www.pallier.org)

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