How do I make a list of data frames?
How do I make a list of data frames and how do I access each of those data frames from the list? For … Read more
r-faq
Find the day of a week
Let’s say that I have a date in R and it’s formatted as follows. date 2012-02-01 2012-02-01 2012-02-02 Is there any way in … Read more
Change R default library path using .libPaths in Rprofile.site fails to work
I am running R on Windows, not as an administrator. When I install a package, the following command doesn’t work: > install.packages(“zoo”) Installing … Read more
What are the main differences between R data files?
What are the main differences between .RData, .Rda and .Rds files? Are there differences in compression, etc.? When should each type be used? … Read more
Add regression line equation and R^2 on graph
I wonder how to add regression line equation and R^2 on the ggplot. My code is: library(ggplot2) df <- data.frame(x = c(1:100)) df$y … Read more
How to import multiple .csv files at once?
Suppose we have a folder containing multiple data.csv files, each containing the same number of variables but each from different times. Is there … Read more
Determine path of the executing script
I have a script called foo.R that includes another script other.R, which is in the same directory: #!/usr/bin/env Rscript message(“Hello”) source(“other.R”) But I … Read more
Why are these numbers not equal?
The following code is obviously wrong. What’s the problem? i <- 0.1 i <- i + 0.05 i ## [1] 0.15 if(i==0.15) cat(“i … Read more
ggplot with 2 y axes on each side and different scales
I need to plot a bar chart showing counts and a line chart showing rate all in one chart, I can do both … Read more
Combine two data frames by rows (rbind) when they have different sets of columns
Is it possible to row bind two data frames that don’t have the same set of columns? I am hoping to retain the … Read more