From the output of str(cc2), the variable inside of the data.table, V1, is itself a list. This means that cc2 is a nested list of length 1. The error is occurring because table calls sort.list, which requires an atomic vector as input. Try using unlist: unlist will (recursively) extract elements from their list containers. So unlist(cc2) will return a vector, which works directly … Read more
dev.off() closes the current graphical device. This clears all of the plots for me in RStudio as long as I don’t have a different graphical device open at the moment. If you do have other graphical devices open then you can use dev.list() to figure out which graphical device is RStudio’s. The following should do that but I haven’t tested … Read more
You need to map attributes to aesthetics (colours within the aes statement) to produce a legend. I understand where Roland is coming from, but since this is only 3 attributes, and complications arise from superimposing bars and error bars this may be reasonable to leave the data in wide format like it is. It could … Read more
The thing on the right of <- is a formula object. It is often used to denote a statistical model, where the thing on the left of the ~ is the response and the things on the right of the ~ are the explanatory variables. So in English you’d say something like “Species depends on Sepal Length, Sepal Width, Petal Length and Petal Width”. … Read more
The $ allows you extract elements by name from a named list. For example You can find the names of a list using names() This is a basic extraction operator. You can view the corresponding help page by typing ?Extract in R.
Use a list: Think of it as a map/dictionary/associative array that is being indexed by an integer. And if you want to take a string like the one above and turn it into a list of vectors: I’m using strsplit to split by newlines, then applying strsplit again to each line. The as.numeric is there … Read more
You use attach without detach – every time you do it new call to attach masks objects attached before (they contain the same names). Either use detach or do not use attach at all. Nice discussion and tips are here.
You can use theme_get() to display the possible options for theme. You can control the legend font size using: replacing X with the desired size.
Suppose I have a vector that is nested in a dataframe one or two levels. Is there a quick and dirty way to access the last value, without using the length() function? Something ala PERL’s $# special var? So I would like something like: instead of
Here’s a solution using base R graphics: