r-faq Archives - Page 2 of 7

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 ...

May 21, 2022
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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 ...

May 21, 2022
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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? ...

May 21, 2022
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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 ...

May 19, 2022
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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 ...

May 18, 2022
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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 ...

May 18, 2022
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Why are these numbers not equal?

The following code is obviously wrong. What’s the problem? i <- 0.1 i <- i + 0.05 i ##...

May 17, 2022
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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 ...

May 17, 2022
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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 ...

May 17, 2022
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