Every time I make a plot using ggplot, I spend a little while trying different values for hjust and vjust in a line like + opts(axis.text.x = theme_text(hjust = 0.5)) to get the axis labels to line up where the axis labels almost touch the axis, and are flush against it (justified to the axis, … Read more
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’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
EDIT: Hadley Wickham points out that I misspoke. R CMD check is throwing NOTES, not Warnings. I’m terribly sorry for the confusion. It was my oversight. The short version R CMD check throws this note every time I use sensible plot-creation syntax in ggplot2: no visible binding for global variable [variable name] I understand why … Read more
I’ve been getting up to speed with R in the last month. Here is my question: What is a good way to assign colors to categorical variables in ggplot2 that have stable mapping? I need consistent colors across a set of graphs that have different subsets and different number of categorical variables. For example, plot1 … Read more
I have a really simple question, which I am struggling to find the answer to. I hoped someone here might be able to help me. An example dataframe is presented below: a <- c(1:10) b <- c(10:1) df <- data.frame(a,b) library(ggplot2) g = ggplot(data=df) + geom_point(aes(x=a, y=b)) + xlab(“x axis”) g I just want to … Read more
The data I’m playing with comes from the internet source listed below nba <- read.csv(“http://datasets.flowingdata.com/ppg2008.csv”, sep=”,”) What I want to do, is create a 2D points graph comparing two metrics from this table, with each player representing a dot on the graph. I have the following code: nbaplot <- ggplot(nba, aes(x= MIN, y= PTS, colour=”green”, … Read more
With this data frame (“df”): year pollution 1 1999 346.82000 2 2002 134.30882 3 2005 130.43038 4 2008 88.27546 I try to create a line chart like this: plot5 <- ggplot(df, aes(year, pollution)) + geom_point() + geom_line() + labs(x = “Year”, y = “Particulate matter emissions (tons)”, title = “Motor vehicle emissions in Baltimore”) The … Read more
I am plotting a graph with a categorical variable on the x axis and a numerical variable on the y axis. For the x axis, given that there are many data points, the default text formatting causes the label for each tick mark to overlap with other labels. How do I (a) change the font … Read more
I’m generating plots for some data, but the number of ticks is too small, I need more precision on the reading. Is there some way to increase the number of axis ticks in ggplot2? I know I can tell ggplot to use a vector as axis ticks, but what I want is to increase the … Read more
