CODEWITHSUNDEEP
rggplot2
Lu Wang
Lu Wang

Reputation:

How to change color of scatterplot in ggplot2

In ggplot2, how could I change the color of coloring in scatter plot?

Upvotes: 10

Views: 26490

Answers (3)

Christopher DuBois
Christopher DuBois

Reputation: 43440

Here's a small dataset:

dat <- data.frame(x=1:20,
                  y=rnorm(20,0,10),
                  v=20:1)

Suppose I want my points colored using the value v. I can change the way in which the coloring is performed using the scale_colour_gradient() function. 

library(ggplot2)
qplot(x,y,data=dat,colour=color,size=4) + 
  scale_colour_gradient(low="black", high="white")

alt text

This example should just get you started. For more, check out the scale_brewer() mentioned in the other post.

Upvotes: 12

Tommy O&#39;Dell
Tommy O&#39;Dell

Reputation: 7109

If your data have discrete categories that you wish to colour, then your task is a bit easier. For example, if your data look like this, with each row representing a transaction,

> d <- data.frame(customer = sample(letters[1:5], size = 20, replace = TRUE),
>                sales = rnorm(20, 8000, 2000),
>                profit = rnorm(20, 40, 15))
> head(d,6)
customer    sales   profit
        a 8414.617 15.33714
        a 8759.878 61.54778
        e 8737.289 56.85504
        d 9516.348 24.60046
        c 8693.642 67.23576
        e 7291.325 26.12234

and you want to make a scatter plot of transactions coloured by customer, then you can do this

p <- ggplot(d, aes(sales,profit))
p + geom_point(aes(colour = customer))

to get....

sales vs profit coloured on customer

Upvotes: 8

Ian Fellows
Ian Fellows

Reputation: 17348

check out the ggplot documentation for scale_brewer http://www.had.co.nz/ggplot2/scale_brewer.html

some examples:

#see available pallets:

library(RColorBrewer)
display.brewer.all(5)

#scatter plot
dsamp <- diamonds[sample(nrow(diamonds), 1000), ] 
d <- qplot(carat, price, data=dsamp, colour=clarity)
dev.new()
d
dev.new()
d + scale_colour_brewer(palette="Set1")
dev.new()
d + scale_colour_brewer(palette="Blues")

Upvotes: 9

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