A new 'dataframe' package is on CRAN. This is a modified version
of the data frame code in R, modified to make fewer copies of the inputs
and run faster, e.g.
as.data.frame(a vector)
makes 1 copy of the vector rather than 3,
data.frame(a vector)
makes 3 copies rather than 6, and
x[, "a"] <- newValue
makes (2,2,1) copies of (old data frame, new column, integer vector
of row names) rather than (6,4,2).
Functionality should be identical to existing R code, with two exceptions:
* bug fix, if x has two columns, then x[[4]] <- value will fail rather than
producing an illegal data frame
* round(a data frame with numeric and factor columns)
rounds the numeric columns and leaves the factor columns unchanged, rather
than failing.
Tim Hesterberg
NEW! Mathematical Statistics with Resampling and R, Chihara & Hesterberg
http://www.amazon.com/Mathematical-Statistics-Resampling-Laura-Chihara/dp/1118029852/ref=sr_1_1?ie=UTF8
http://home.comcast.net/~timhesterberg
(resampling, water bottle rockets, computers to Costa Rica, shower = 2650 light
bulbs, ...)
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