IT Nursery
I started getting a new message (see post title) when running group_by and summarise() after updating to dplyr development version 0.8.99.9003. Here is an example to recreate the output:...
I have a persistent multiple warning of “unknown column” for all types of commands (e.g., str(x) to installing updates on packages), and not sure how to debug this or...
Suppose I want to calculate the proportion of different values within each group. For example, using the mtcars data, how do I calculate the relative frequency of number of...
Can the mutate be used when the mutation is conditional (depending on the values of certain column values)? This example helps showing what I mean. structure(list(a = c(1, 3,...
Is there a more succinct way to get one column of a dplyr tbl as a vector, from a tbl with database back-end (i.e. the data frame/table can’t be...
I want to use dplyr::mutate() to create multiple new columns in a data frame. The column names and their contents should be dynamically generated. Example data from iris: library(dplyr)...
tibble (previously tbl_df) is a version of a data frame created by the dplyr data frame manipulation package in R. It prevents long table outputs when accidentally calling the...
I have to filter a data frame using as criterion those row in which is contained the string RTB. I’m using dplyr. d.del <- df %>% group_by(TrackingPixel) %>% summarise(MonthDelivery...
Overview I’m relatively familiar with data.table, not so much with dplyr. I’ve read through some dplyr vignettes and examples that have popped up on SO, and so far my...