R help - Mar 2008 - Change the index argument of a series

This is probably very trivial - so I can't find an answer in the help files.

When I have a series x (x[1], x[2], ... x[n]) and I want to construct a
new series y (y[1], y[2], ... y[m]) such that y's are either interpolations
of the x's (when m > n) or a weighted mean (when m < n), is there
any direct function to do it?

For example, passing from 3 to 4 would be the same as multiplying
the series by the matrix:

rbind(c(3/3, 0, 0),
  c(1/3, 2/3, 0),
  c(0, 2/3, 1/3),
  c(0, 0, 3/3))

In the same way, passing from 4 to 3 would be the same as multiplying
the series by the matrix

rbind(c(3/4, 1/4, 0, 0),
  c(0, 2/4, 2/4, 0),
  c(0, 0, 1/4, 3/4))

How can I do it in a simple way?

Alberto Monteiro

See ?rollapply and ?rollmean in the zoo package
and ?filter and ?embed in the core of R.

On Sat, Mar 8, 2008 at 1:38 PM, Alberto Vieira Ferreira Monteiro
<albmont at centroin.com.br> wrote:
> This is probably very trivial - so I can't find an answer in the help
files.
>
> When I have a series x (x[1], x[2], ... x[n]) and I want to construct a
> new series y (y[1], y[2], ... y[m]) such that y's are either
interpolations
> of the x's (when m > n) or a weighted mean (when m < n), is there
> any direct function to do it?
>
> For example, passing from 3 to 4 would be the same as multiplying
> the series by the matrix:
>
> rbind(c(3/3, 0, 0),
>  c(1/3, 2/3, 0),
>  c(0, 2/3, 1/3),
>  c(0, 0, 3/3))
>
> In the same way, passing from 4 to 3 would be the same as multiplying
> the series by the matrix
>
> rbind(c(3/4, 1/4, 0, 0),
>  c(0, 2/4, 2/4, 0),
>  c(0, 0, 1/4, 3/4))
>
> How can I do it in a simple way?
>
> Alberto Monteiro
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>