plotting stacked points using ggplot

Question

I have a data frame and I would like to stack the points that have overlaps exactly on top of each other.

here is my example data:

value <- c(1.080251e-04, 1.708859e-01, 1.232473e-05, 4.519876e-03,2.914256e-01, 5.869711e-03, 2.196347e-01,4.124873e-01, 5.914052e-03, 2.305623e-03, 1.439013e-01, 5.407597e-03, 7.530298e-02, 7.746897e-03)
names = letters[1:7]
data <- data.frame(names = rep(names,), group = group, value = value, stringsAsFactors = T)
group <- c(rep("AA", 7) , rep("BB", 7))

I am using the following command:

p <- ggplot(data, aes(x = names, y = "", color = group)) + 
geom_point(aes(size = -log(value)), position = "stack") 
plot(p)

But the stacked circle outlines out of the grid. I want it close or exactly next to the bottom circle. do you have any idea how I can fix the issue?

Thanks,

Try aes(y = 1... and then set new y limits: ylim(1,2). If this is not working, please provide a reproducible example of your dataset (stackoverflow.com/questions/5963269/…) — dc37
– dc37, Commented Mar 1, 2020 at 1:56
Thanks for your response! It did not work. I have edited my question. Can you please take a look at it? — say.ff
– say.ff, Commented Mar 1, 2020 at 2:21

Edward · Accepted Answer · 2020-03-01 06:11:53Z

4

The y-axis has no numeric value, so use the group instead. And we don't need the color legend now since the group labels are shown on the y-axis.

ggplot(data, aes(x = names, y = group, color = group)) + 
  geom_point(aes(size = -log(value))) +
  guides(color=FALSE)

edited Mar 1, 2020 at 6:11

answered Mar 1, 2020 at 3:52

Edward

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6 Comments

say.ff Over a year ago

Thats a good idea too. Do you know how can I decrease the distance between vertical lines. I want the circles of two groups to be closer to each other.

Edward Over a year ago

After producing the graph, reduce the height of the device manually. Or when saving to a file, tinker with the height argument in the ggsave function. For example, ggsave("figure1.png", height=2, width=4). See my edited graph.

say.ff Over a year ago

Thanks for your reply. It was really helpful. Using ggsave() reduces the hight of my figure But not as much as I want. Do you know any other way that I can play with the horizontal lines to reduce the distance between them?

Edward Over a year ago

You want the dots closer together, almost touching?

Edward Over a year ago

Maybe you can increase the size of the points: + scale_size_continuous(range=c(3,10)) and/or add more discrete categories to the y-axis: + ylim("","AA","BB","")

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