ggplot2 bar chart sign on y-axis

user8491385 Published at Dev

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user8491385

I have the following data :

mydata <- data.frame(x = c("UK1", "UK2", "UK3", "UK4", "UK5", "UK6", "UK7"), 
                     n = c(50, 55, 58, 64, 14, 18, 45), 
                     F = c(-6, 17, 26, -37, 44, -22, 15), 
                     z = c("a", "a", "b", "a" , "b", "b", "a"))

I want to create a ggplot (bar chart) of column x (x axis) against column n (y-axis) colour split by column z. The tricky part is I want to bar chart to be going up the way if the value in F is positive and down the way if negative. Is this possible with ggplot?

PoGibas

Solution using sign:

You can use sign() to extract sign of F and multiply that by n: n * sign(F)

library(ggplot2)

mydata <- data.frame(x = c("UK1", "UK2", "UK3", "UK4", "UK5", "UK6", "UK7"), 
                     n = c(50, 55, 58, 64, 14, 18, 45), 
                     F = c(-6, 17, 26, -37, 44, -22, 15), 
                     z = c("a", "a", "b", "a" , "b", "b", "a"))

ggplot(mydata, aes(x, n * sign(F), fill = z)) +
    geom_bar(stat = "identity", position = "dodge")

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edited at2020-11-17

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