How do I change the formatting of numbers on an axis with ggplot?

Question

I'm using R and ggplot to draw a scatterplot of some data, all is fine except that the numbers on the y-axis are coming out with computer style exponent formatting, i.e. 4e+05, 5e+05, etc. This is obviously unacceptable, so I want to get it to display them as 500,000, 400,000, and so on. Getting a proper exponent notation would also be acceptable.The code for the plot is as follows: p <- ggplot(valids, aes(x=Test, y=Values)) + geom_point(position="jitter") + facet_grid(. ~ Facet) + scale_y_continuous(name="Fluorescent intensity/arbitrary units") + scale_x_discrete(name="Test repeat") + stat_summary(fun.ymin=median, fun.ymax=median, fun.y=median, geom="crossbar")Any help much appreciated.

Answer 1

You may want to try using the `comma()` function from the `scales` library inside the `scale_y_continuous`. Here's an example:

```

# install.packages(scales)

library(tidyverse)

p <- ggplot(diamonds, aes(x=table,

y=price,

color = color)) +

geom_point(position="jitter") +

scale_y_continuous(name="Fluorescent intensity arbitrary units",

label = scales::comma) +

scale_x_discrete(name="Test repeat") +

stat_summary(fun.ymin=median, fun.ymax=median, fun.y=median, geo ="crossbar")

p # y axis should be comma formatted

```

For your reference, I am using R version 3.5.0. Hope this helps!