[R] list & calculaton in many df subsets
Spencer Graves
spencer.graves at pdf.com
Tue May 18 17:18:33 CEST 2004
Have you considered "lapply(by(...), ...)"? The help for "by" includes
an example using sapply. See also Venables and Ripley, Modern Applied
Statistics with S.
hope this helps. spencer graves
Christian Schulz wrote:
>Hi,
>
>have anybody a hint /starting point how i can
>enlarge my code that's posiible for me make any calculaton's
>with variables in the 64 subset's.
>
>Example:
>I want calculate difference of two variables inside every
>of the 64 subset data.frames and getting this value in tList!
>
>Many thanks,
>Christian
>
>
>tasign <- paste("tList[[n]] <- try(dtree[dtree$class02 ==
>paste(data$class02[n]) & dtree$class04 == paste(data$class04[n]) &
>dtree$PREDICT==paste(data$PREDICT[n]),])")
>tasign <- parse(text=tasign)[[1]]
>
>for(n in 1:nrow(data)) {
> TAsign <- do.call("substitute",list(tasign,list(n=n,X=as.name(n))))
> eval(TAsign)
>}
>
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