====== GNU R ======


The [[https://www.r-project.org/|GNU R programming language]] is often paired with [[https://posit.co/download/rstudio-desktop/|posit's RStudio Desktop IDE]] and a suit of libraries (language packages) known as [[:tools:tidyverse|tidyverse]] (includes ''dplyr'' and ''ggplot2''). 

You can also find a web interface to [[http://rhea.wpic.upmc.edu:8787/|Rstudio on rhea]] (also [[:admin:remoteaccess]]).

[[:tools:tutorials|Tutorials]] contains additional resources.

See [[:tools:r:issues]] for log of debugged problems.
===== Notes =====
==== na.action ====
When adding module residuals back to a dataframe, you need ''residuals()'' to return the same length as the input data.frame. use ''lm(na.action=na.exclude)''.

For example,

<code=R>
d <-  data.frame(x=c(1:4,NA),y=1:5);
m <- lm(x~y,d,na.action=na.exclude);
nrow(d); 
length(m$residuals); 
length(residuals(m))
   [1] 5
   [1] 4
   [1] 5
</code>


This avoids the error

  Error in `$<-.data.frame`(`*tmp*`, ...
    replacement has 237 rows, data has 348



===== Backlinks =====


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