[R] very slow code execution

[salah maadawy]

Hi Micheal, Maybe there is a simple way but i wanted to get the lowest aicc
ana i could not find a way to do so, that's why i created the  table to
store all possible outcomes and then i can easily get the minimum value and
the values of (i,j and k) used for that minimum value. The first column in
the table is AICc[,1] to store i and second column for j and so on. Maybe i
am mistaken and this won't give me what i want, the code been running for 5
hours now. So i am waiting

On Wed, Feb 6, 2019 at 4:59 PM Michael Dewey <lists using dewey.myzen.co.uk>
wrote:

> This is not an answer to your speed problem but are your assignments to
> AICc[,1] and so on doing what you hope they are doing?
>
> Michael
>
> On 06/02/2019 12:03, salah maadawy wrote:
> > i am a beginner regarding R but i am trying to do a simple thing, but it
> is
> > taking too much time and i am asking if there is any way to achieve what
> i
> > need, i have a time series data set with 730 data points, i detected 7,
> 354
> > and 365 seasonality periods. i am trying to use Fourier terms for
> > seasonality and for loop to get the K value for each while minimizing
> AICc,
> > my code is
> >
> >      AICc<- data.table(matrix(nrow = 96642, ncol = 4))for (i in 1:3) {
> >    for (j in 1:177) {
> >      for (k in 182) {                     #i,j and k values are choosen
> > with regad that K cannot exceed seasonality period/2
> >        z1 <- fourier(ts(demand,frequency = 7), K=i)
> >        z2 <- fourier(ts(demand,frequency=354), K=j)
> >        z3 <- fourier(ts(demand,frequency = 365),K=k)
> >        fit <- auto.arima(demand, xreg =cbind(z1,z2,z3),
> >           seasonal = FALSE)
> >        fit$aicc
> >        AICc[,1]<-i
> >        AICc[,2]<-j
> >        AICc[,3]<-k
> >        AICc[,4]<-fit$aicc
> >      }
> >
> >    }
> > }
> >    AICc
> >
> > i have created a data table to store AICc values from all possible i,j,k
> > combinations so that i can find later the minimum AICc value. the problem
> > now is that it is taking forever to do so not only to iterate all
> > combinations but also due to the large K values.
> >
> > , is there any possible solution for this? thank you in advance
> >
> >       [[alternative HTML version deleted]]
> >
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>
> --
> Michael
> http://www.dewey.myzen.co.uk/home.html
>

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