ggplot : scatterplot combination between columns

Question

I have the following data.frame of continious values. I would like to plot all combinaison between X et Y with ggplot:

  library(ggplot2)
  df = data.frame(X=1:10, Y1=1:10, Y2=1:10, Y3=1:10)

For this example, I want 3 plots : (X vs Y1) (X vs Y2) (X vs Y3).

What type of plot are you expecting? What have you tried so far? — Adam Quek
– Adam Quek, Commented Apr 19, 2017 at 9:30
Assuming that you are asking for dotplot based on your title, what do you want to facet_wrap the plot by? — Adam Quek
– Adam Quek, Commented Apr 19, 2017 at 9:31
do you mean scatterplot? A dotplot doesnt make much sense for your example. — mtoto
– mtoto, Commented Apr 19, 2017 at 9:34
yes a scatterplot sorry ! I would like to display my 3 plots inside one using facet feature — DrIDK
– DrIDK, Commented Apr 19, 2017 at 9:37

mtoto · Accepted Answer · 2017-04-19 09:40:26Z

3

You need to reshape your data first to "long" format, so you can facet_wrap() by key. Using tidyr:

library(tidyr)
library(ggplot2)

df %>% gather(key, value, -X) %>%
  ggplot(.,aes(x = X, y = value)) + 
  geom_point() +
  facet_wrap(~key)

answered Apr 19, 2017 at 9:40

mtoto

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1 Comment

User800701 Over a year ago

And maybe facet_wrap(~ key, scales = "free") in case that Ys are on different scales.

DrIDK · Accepted Answer · 2017-04-19 09:49:50Z

2

I also succeed by using melt :

 df = data.frame(X=1:10, Y1=1:10, Y2=1:10, Y3=1:10)
 df.m = melt(df, id.vars = X)
 ggplot(df.m, aes(x=X, y=value)) + geom_line() + facet_wrap(~variable)

answered Apr 19, 2017 at 9:49

DrIDK

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