I want to annotate some text on last facet of the plot with the following code: library(ggplot2) p <- ggplot(mtcars, aes(mpg, wt)) + geom_point() p <- p + facet_grid(. ~ cyl) p <- p + annotate(“text”, label = “Test”, size = 4, x = 15, y = 5) print(p) But this code annotates the text … Read more
I have a data frame like this: df VALUE ABS_CALL DETECTION P-VALUE 1007_s_at “957.729231881542” “P” “0.00486279317241156” 1053_at “320.632701283368” “P” “0.0313356324173416” 117_at “429.842323161046” “P” “0.0170004527476119” 121_at “2395.7364289242” “P” “0.0114473584876183” 1255_g_at “116.493632746934” “A” “0.39799368200131” 1294_at “739.927122116896” “A” “0.0668649772942343” I want to convert the row names into the first column. Currently I use something like this to make … Read more
I have a persistent multiple warning of “unknown column” for all types of commands (e.g., str(x) to installing updates on packages), and not sure how to debug this or fix it. The warning “unknown column” is clearly related to a variable in a tbl_df that I renamed, but the warning comes up in all kinds … Read more
I am trying to understand at a high level what the differences between R Markdown and R NoteBook. I know they are interrelated but I would like to figure out how they are related. My understanding is this: I know R Notebooks are really R Markdown documents but I am confused about the terminologies. RStudio … Read more
I’m plotting a categorical variable and instead of showing the counts for each category value. I’m looking for a way to get ggplot to display the percentage of values in that category. Of course, it is possible to create another variable with the calculated percentage and plot that one, but I have to do it … Read more
As the question asks, is there a control sequence in R similar to C’s ternary operator? If so, how do you use it? Thanks! 8 Answers 8
This is meant to be a FAQ question, so please be as complete as possible. The answer is a community answer, so feel free to edit if you think something is missing. This question was discussed and approved on meta. I am using R and tried some.function but I got following error message: Error: could … Read more
Is there a way to get the list index name in my lapply() function? n = names(mylist) lapply(mylist, function(list.elem) { cat(“What is the name of this list element?\n” }) I asked before if it’s possible to preserve the index names in the lapply() returned list, but I still don’t know if there is an easy … Read more
Many times I have seen the set.seed function in R, before starting the program. I know it’s basically used for the random number generation. Is there any specific need to set this? 7 Answers 7
The R language has a nifty feature for defining functions that can take a variable number of arguments. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage: > data.frame(letters=c(“a”, “b”, “c”), numbers=c(1,2,3), notes=c(“do”, “re”, “mi”)) letters numbers notes … Read more
