Filter out rows from one data.frame that are present in another data.frame

Question

Suppose I have a larger data.frame and a smaller one. If the smaller one is contained inside the larger one, how can I subtract the rows of the smaller data.frame, leaving a

Answer 1

In dplyr:

library(dplyr)

setdiff(BigDF, SmallDF)

More Info: Hadley's dply cheatsheet: https://www.rstudio.com/wp-content/uploads/2015/02/data-wrangling-cheatsheet.pdf

Concise Set Operations functions with examples http://rpackages.ianhowson.com/cran/dplyr/man/setops.html (But the entire Grammar of Data Manipulation is a great resource overall)

And although the below is not in direct answer to your question - it is frequently related for me (and has been very useful)

If you wish to capture the new changes that have occured between a new dataframe and a previous version of the same dataframe (inside the same records) you will want to make your code look as below:

setdiff(NewDF, OldDF)