[R] RES: time series interpolation

[David Winsemius]

On Jun 29, 2011, at 2:37 PM, Filipe Leme Botelho wrote:

> Hi Tom,
>
> At least to me it´s hard to picture what´s wrong without further  
> details regarding your data. I use spline/linear interpolation of  
> time series regularly, so maybe this example help you out.
>
>> ci_x
> [1]   1   4  69 131 194 256 320 382
>> ci_y
> [1] 0.1211 0.1213 0.1233 0.1241 0.1250 0.1254 0.1255 0.1255
>>
>> approx(x=ci_x, y=ci_y, n=ci_x[length(ci_x)])$y
>
>
> Regards,
> Filipe.
>
> -----Mensagem original-----
> De: r-help-bounces at r-project.org [mailto:r-help-bounces at r- 
> project.org] Em nome de tomtomme
> Enviada em: quarta-feira, 29 de junho de 2011 12:28
> Para: r-help at r-project.org
> Assunto: [R] time series interpolation
>
> Hi there,
> I´ve got a datatable in R which I try to interpolate with this and  
> get the
> Error below:
>
>> new$temp<- approx(w03_11temp$temp, n = (nrow(w03_11temp)*5))$y

It looks to me that you are trying to assign a column vector into a  
dataframe but you are constructing it with five times as many elements  
as the dataframe has rows. I am unable to explain the error message,  
however. You say this is a 'datatable', so maybe the datatable  
maintainers would have a better idea, assuming you are using your  
terms correctly.


>
> Error in new$temp <- approx(w03_11temp$temp, n = (nrow(w03_11temp) *  
> 5))$y :
>  Object of type 'closure' not registered
>
> Any idea?? Thanks a lot.
>
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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David Winsemius, MD
West Hartford, CT