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I'd like to put a label above only the modal bar (the tallest peak) on my geom_col plot, giving the x-axis value (CAG). Here's an example, but I can only get it to label every peak.
x <- seq(-20, 20, by = .1)
y <- dnorm(x, mean = 5.0, sd = 1.0)
z <- data.frame(CAG = 1:401, height = y)
ggplot(z, aes(x=CAG, y=height)) +
geom_col() +
geom_text(aes(label = CAG))
I'd be very grateful for help with labelling only the top peak
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Therefore data should be arranged by the label column before calling geom_text (). Note that this argument is not supported by geom_label (). Note that when you resize a plot, text labels stay the same size, even though the size of the plot area changes. This happens because the "width" and "height" of a text element are 0.
Bar chart. geom_col makes the height of the bar from the values in dataset. bar width. By default, set to 90% of the resolution of the data Using the described geometry, you can insert a simple geometric object into your data visualization – bar layer that is defined by two positional aesthetic properties ( x and y ).
They can be used by themselves as scatterplots or in combination with other geoms, for example, for labeling points or for annotating the height of bars. geom_text () adds only text to the plot. geom_label () draws a rectangle behind the text, making it easier to read. Set of aesthetic mappings created by aes () or aes_ ().
If TRUE, text that overlaps previous text in the same layer will not be plotted. check_overlap happens at draw time and in the order of the data. Therefore data should be arranged by the label column before calling geom_text (). Note that this argument is not supported by geom_label ().
Just subset your dataset in geom_text to keep only the maximal value of y:
ggplot(z, aes(x=CAG, y=height)) +
geom_col() +
geom_text(data = subset(z, y == max(y)), aes(label = CAG))
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