# rPref 1.0 – Computing Pareto Optima and Database Preferences

[social4i size=”large” align=”float-right”]
.php?section=examples for more examples.
The changes of this version include:
– A new function get_btg_dot to generate Better-Than-Graphs induced by the preference using Graphviz.
– Fixed compatibility issues with new versions of dplyr and testthat.
Comments and contributions are very welcome via github:
https://github.com/patrickroocks/rpref
Best regards,
Patrick Roocks

*This is a re-post from the R packages mailing list*Dear R users, the first 1.0 version of the rPref package is now on CRAN. rPref allows to select the Pareto-optimal tuples from a data set, also called Skylines in the database community. For example, optimal tuples from mtcars according to “high(mpg) * high(hp)” (where “*” is the Pareto operator) are those cars, for which no other dominating car exists. There, a car dominates another car if its horsepower or miles-per-gallon value is strictly better while the other value is better or equal. See http://p-roocks.de/rpref/index