Thanks for your quick response. I am following along in an online textbook on how to use summarise / group_by. In general column names in R need to be formatted without spaces for R to recognize them properly. Hello! Useful functions. This is a known issue of installing R packages on Windows because DLLs of packages loaded in R cannot be updated, on that platform. And if the external API has not changed, you won't get a crash when calling into the outdated DLL, so that installation problem might go completely unnoticed, causing strange behaviours as we are witnessing here. I am working in a project in RStudio (0.97.248). The R chunks work great and produce objects in my workspace. Having questions checked as resolved makes it a bit easier to navigate the site visually and see which threads still need help. Hi, I have R-3.6.1 so I will un-install and download the versions you mentioned. Hello: I am a new user, running the latest version of R on my Mac. If your question's been answered (even if by you), would you mind choosing a solution? Nothing is accessible from the R context, so you should not expect the query to succeed unless table_id exists within the database. Follow the on-screen instructions and wait for the update to complete. Expand Network adapter, right click on the driver with yellow exclamation mark over the icon and select Update this software from the context menu. Dplyr package in R is provided with select() function which select the columns based on conditions. But in their cases, they want to actually use data.table inside their package, but here in this case it does not use data.table inside but provides a function user might pass in a data.table object … starts_with(), ends_with(), contains() matches() num_range() one_of() everything() To drop variables, use -.. I came across the following from the nycflights13 data package: by_day <- group_by(flights, year, month, day) summarise(by_day, delay = mean(dep_delay, na.rm = TRUE)) In the textbook, it should yield the following: #> Source: local data frame [365 x 4]_ #> Groups: year, month [? Object not Found Error on a .csv file. (See FAQ below for how). With today’s post, DataCamp wants to show you that these R data structures don’t need to be hard: we offer you 15 easy, straightforward solutions to the most frequently occuring problems with data.frame. Next Step. This limit is is true for variables as well, but it will not auto-format them for you. No worries! These issues have been selected from the most recent and sticky or upvoted Stack Overflow posts. Well, not necessarily. Importing files with spaces, R will drop in a period and remove the space. Select function in R is used to select variables (columns) in R using Dplyr package. Best I am having trouble knitting inline r code. 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