[R] Confused: Looping in dataframes

[Paul Hiemstra]

On 06/25/2010 10:02 AM, phani kishan wrote:
> Hey,
> I have a data frame x which consists of say 10 vectors. I essentially want
> to find out the best fit exponential smoothing for each of the vectors.
>
> The problem while I'm getting results when i say
>    
>> lapply(x,ets)
>>      
> I am getting an error when I say
>    
>>> myprint
>>>        
> function(x)
> {
> for(i in 1:length(x))
> {
> ets(x[i],model="AZZ",opt.crit=c("amse"))
>    
Hi,

Please provide a reproducible example, as stated in the posting guide. 
My guess is that replacing x[i] by x[[i]] would solve the problem. 
Double brackets return a vector in stead of a data.frame that has just 
column i.

cheers,
Paul
> }
> }
>
> The error message is that* "Error in ets(x[i], model = "AZZ", opt.crit =
> c("amse")) :
>    y should be a univariate time series"*
>
> Could someone please explain why this is happening? I also want to be able
> to extract data like coef's, errors (MAPE,MSE etc.)
>
> Thanks and regards,
> Phani
>    


-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
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