How do I make a list of data frames and how do I access each of those data frames from the list? For example, how can I put these data frames in a list ? d1 <- data.frame(y1 = c(1, 2, 3), y2 = c(4, 5, 6)) d2 <- data.frame(y1 = c(3, 2, 1), y2 … Read more
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 R to add another column with the day of the week associated with the date? The dataset is really large, so it would not make sense to go through manually and make … Read more
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 package(s) into ‘C:/Program Files/R/R-2.15.2/library’ (as ‘lib’ is unspecified) Warning in install.packages : ‘lib = “C:/Program Files/R/R-2.15.2/library”‘ is not writable To install a package, I have to specify a library location: install.packages(“zoo”, lib=”C:/software/Rpackages”) … Read more
What are the main differences between .RData, .Rda and .Rds files? Are there differences in compression, etc.? When should each type be used? How can one type be converted to another? 2 Answers 2
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$y <- 2 + 3 * df$x + rnorm(100, sd = 40) p <- ggplot(data = df, aes(x = x, y = y)) + geom_smooth(method = “lm”, se=FALSE, color=”black”, formula = y ~ … Read more
Suppose we have a folder containing multiple data.csv files, each containing the same number of variables but each from different times. Is there a way in R to import them all simultaneously rather than having to import them all individually? My problem is that I have around 2000 data files to import and having to … Read more
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 want R to find that other.R no matter what the current working directory. In other words, foo.R needs to know its own path. How can I do that? 30 Answers 30
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 equals 0.15”) else cat(“i does not equal 0.15”) ## i does not equal 0.15 6 Answers 6
I need to plot a bar chart showing counts and a line chart showing rate all in one chart, I can do both of them separately, but when I put them together, I scale of the first layer (i.e. the geom_bar) is overlapped by the second layer (i.e. the geom_line). Can I move the axis … Read more
Is it possible to row bind two data frames that don’t have the same set of columns? I am hoping to retain the columns that do not match after the bind. 13 Answers 13
