R help - Nov 2011 - Function not found, maybe respective package has to be put in environment?

Hello everybody,

I have a problem and would like to start with an example:

library(snow)
library(tseries)
fn <- function(x) adf.test(x)

clusterApply(cl=cl, x=x , fun=fn)


R cannot find the function adf.test() because it is inside the function fn().
This problem does not occur when, for example, fn <- function(x) mean(x)
holds. Therefore, I think the package tseries has to be put somehow in the
environment where also the package stats is because the function mean() works
but the function adf.test() not.

But how to solve the problem?

Remark:
The above code is an example to illustrate my problem. My original function is
more complex and somewhere inside my function I refer to some other function
from the package tsDyn.


I hope you can help me.

Kind regards,
Andy.

You have to load tseries on the nodes, not only on the master, i.e.:

clusterEvalQ(cl, library("tseries"))

Best,
Uwe Ligges



On 13.11.2011 19:34, Andreas Klein wrote:
> Hello everybody,
>
> I have a problem and would like to start with an example:
>
> library(snow)
> library(tseries)
> fn<- function(x) adf.test(x)
>
> clusterApply(cl=cl, x=x , fun=fn)
>
>
> R cannot find the function adf.test() because it is inside the function
fn(). This problem does not occur when, for example, fn<- function(x) mean(x)
holds. Therefore, I think the package tseries has to be put somehow in the
environment where also the package stats is because the function mean() works
but the function adf.test() not.
>
> But how to solve the problem?
>
> Remark:
> The above code is an example to illustrate my problem. My original function
is more complex and somewhere inside my function I refer to some other function
from the package tsDyn.
>
>
> I hope you can help me.
>
> Kind regards,
> Andy.
>
>
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