[R] List of lists to data frame?

[R. Michael Weylandt]

unlist(..., recursive = F)

Michael

On Wed, Nov 16, 2011 at 6:20 PM,  <rkevinburton at charter.net> wrote:
>
> I would like to make the following faster:
>
>        df <- NULL
>        for(i in 1:length(s))
>        {
>                df <- rbind(df, cbind(names(s[i]), time(s[[i]]$series),
> as.vector(s[[i]]$series), s[[i]]$category))
>        }
>        names(df) <- c("name", "time", "value", "category")
>        return(df)
>
> The s object is a list of lists. It is constructed like:
>
> s[["object"]] <- list(. . . . . .)
>
> where "object" would be the name associated with this list s[[i]]$series
> is a 'ts' object and s[[i]]$category is a name.
>
> Constructing this list is reasonably fast but to do some more processing
> on the data it would be easier if it were converted to a data frame.
> Right now the above code is unacceptably slow at converting this list of
> lists to a data frame. Any suggestions on how to optimize this are
> welcome.
>
> Thank you.
>
> Kevin
>
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>
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