I've noticed a trend (at least on the Google Play store) of application prices ending in x.99, while 'donation' apps usually end on the dollar.  I see the reasoning behind the psychology that makes a user purchase a $0.99 item over one that costs $1.00, but why the trend to keep the prices on the dollar for donation items? 


Question: Install missing R packages when running in bash mode
Answer: You need to specify your CRAN mirror; interactively in R, run

chooseCRANmirror()


to pick an appropriate mirror, then

options("repos")


to see the resulting URL. You can add this permanently to your configuration in ~/.Rprofile:

local({r &lt;- getOption("repos")
   r["CRAN"] &lt;- "&lt;URL from above goes here&gt;" 
   options(repos=r)
})