[R-pkgs] dataframe package

From: Tim Hesterberg <timhesterberg_at_gmail.com>
Date: Tue, 22 May 2012 06:47:42 -0700


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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