Ggplot will now understand in which order to plot name on \( x \) axis. X$name # notice the changed order of factor levels x$name <- factor(x$name, levels = x$name) For that to happen, we need to change the order of factor levels by specifying the order explicitly. What we would like is for R to respect the order in ame. Ggplot(x, aes(x = name, y = val)) + theme_bw() + geom_bar(stat = "identity") The forcats package offers a variety of options for doing this, such as forcats::fctrelevel () for manual reordering or forcats::fctreorder () for ordering by a particular value, e.g. But we would be wrong, as demonstrated below. x <- xĪnd hope ggplot will read our mind. We might naively hope to arrange the data according to some criterion, let's say ascending order of val. Variable name is a factor, and the factor levels in it are ordered, by default, according to alphabet. Always ensure the axis and legend labels display the full variable name. The heights of the bars are proportional to the measured values. Good labels are critical for making your plots accessible to a wider audience. One axisthe x-axis throughout this guideshows the categories being compared, and the other axisthe y-axis in our caserepresents a measured value. # $ name: Factor w/ 10 levels "b","c","f","g".: 2 1 4 3 6 5 8 10 9 7 A bar chart is a graph that is used to show comparisons across discrete categories. Set the angle of the text in the or components of the theme (), e.g. X <- ame(name = as.factor(sample(letters, 10)), val = runif(10))
Here's a quick demonstration of the trick you need to use to convince R and ggplot to do it.įor this exampe, we're assuming that you're trying to plot some factor variable on \( x \) axis and \( y \) axis holds some numeric values. There are three common cases where the default does not display the data correctly.
This is demonstrated in the examples below.
#Ggplot rename x axis groups how to
How to plot factors in a specified order in ggplot How to plot factors in a specified order in ggplotĪ question of how to plot your data (in ggplot) in a desired order often comes up. Details For most applications the grouping is set implicitly by mapping one or more discrete variables to x, y, colour, fill, alpha, shape, size, and/or linetype.
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