In R, how do I subset a data.frame by values from another data.frame?

In R, how do I subset a data.frame by values from another data.frame?



1.R: How to calculate correlation - cor() - for only a ...

Description:I have a dataframe and would like to calculate the correlation
(with Spearman, data is categorical and ranked) but only for a subset of
columns. I tried with all, but ...



2.sorting - How to sort a dataframe by column(s) in R ...

Description:I want to sort a data.frame by multiple columns in R. For
example, with the data.frame below I would like to sort by column z
(descending) then by column b (ascending ...



3.R Language Definition - Cran

Description:2.1.3 Language objects. There are three types of objects that
constitute the R language. They are calls, expressions, and names. Since R
has objects of type ...



4.R FAQ - Cran

Description:Answers many questions on installing, packages, customizing,
Windows features, building from source.



5.R & Bioconductor - Manuals

Description:This R tutorial provides a condensed introduction into the
usage of the R environment and its utilities for general data analysis and
clustering.



6.Using R for statistical analysis - City University of New York

Description:Basics. Clear cache # clear the cache rm(list = ls())
Installing packages # the repositiory PA1 seems to be most stable
(http://lib.stat.cmu.edu/R/CRAN) install ...



7.Choropleth Maps with ArcGIS9 - UC Santa Barbara Geography

Description:Purpose. The general purpose of this exercise is to make maps
of 2003 crime vs. 2004 election results for the Conterminous US. The crime
data are standardized as a ...



8.R Tutorials--Data Frames - Coastal Carolina University

Description:Modifying a Data Frame (not so essential just now) Rule number
one with a bullet: NEVER MODIFY AN ATTACHED DATA FRAME! While this isn't
strictly against the law, it's ...



9.R is my friend - 'R challenge is like the Rubik's cube of ...

Description:mod.in: neural network object or numeric vector of weights, if
model object must be from nnet, mlp, or neuralnet functions: nid: logical
value indicating if neural ...



10.Introduction to R Seminar - Institute for Digital Research ...

Description:Additional Notes on Installing R. For Windows and Mac, there
are binary files to install R. You can download these and just click to
install them.