Drop data frame columns by name
I have a number of columns that I would like to remove from a data frame. I know that we can delete them … Read more
r
Remove rows with all or some NAs (missing values) in data.frame
I’d like to remove the lines in this data frame that: a) contain NAs across all columns. Below is my example data frame. … Read more
Grouping functions (tapply, by, aggregate) and the *apply family
Whenever I want to do something “map”py in R, I usually try to use a function in the apply family. However, I’ve never … Read more
Sort (order) data frame rows by multiple columns
I want to sort a data frame by multiple columns. For example, with the data frame below I would like to sort by … Read more
How to join (merge) data frames (inner, outer, left, right)
Given two data frames: df1 = data.frame(CustomerId = c(1:6), Product = c(rep(“Toaster”, 3), rep(“Radio”, 3))) df2 = data.frame(CustomerId = c(2, 4, 6), State … Read more
How to make a great R reproducible example
This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. … Read more