CODEWITHSUNDEEP
rplotscatter-plot
AviG
AviG

Reputation: 392

in R, how do I have the scatterplot choose a color for a point based on the value of another variable?

I have a data set;

newData <- cbind(c(1,2,3,4,5),c(6,7,8,9,10),c(A,B,A,B,B))

I want to make a scatter plot on a two dimensional plane, but I want the points colored by if they have A or B. Using plot(params), how would I do that?

Upvotes: 0

Views: 30

Answers (1)

G5W
G5W

Reputation: 37661

If you create the variable newData as you describe in the question, then it will be a matrix of text. I think that you want the first two columns to be numbers and the last column to be text. In order to mix numbers and text like that, you need a different data structure. A good one to use is a data.frame

newData <- data.frame(V1 = c(1,2,3,4,5),
    V2 = c(6,7,8,9,10), V3 = c('A','B','A','B','B'))
newData
  V1 V2 V3
1  1  6  A
2  2  7  B
3  3  8  A
4  4  9  B
5  5 10  B

Once you have that, the plot is easy. 

plot(newData[,1:2], pch=20, col=c("red", "blue")[newData$V3])

Basic plot

Upvotes: 1

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