Facetting in ggplot2

Question

I have this dataset: https://dl.dropboxusercontent.com/u/73950/data.csv The dataset contains 3 variables.

Here's how I visualize the data right now:

library(ggplot2)
library(reshape2)
library(RColorBrewer)

dat = read.csv("data.csv", header = FALSE)

myPalette <- colorRampPalette(rev(brewer.pal(11, "Spectral")))
sc <- scale_colour_gradientn(colours = myPalette(100))

ggplot(dat, aes(x=V1, y=V3, colour = V2))+ geom_point(alpha = .2,size = 3) + sc

Instead of just one figure, I'd like to facet the figure to display 3 different ways to attribute variables to each axis and color. As such:

x = V1, y = V2, color = V3
x = V1, y = V3, color = V2
x = V2, y = V3, color = V1

How to do this kind of things with ggplot2's faceting?

Rorschach · Accepted Answer · 2015-07-31 00:31:58Z

3

You can get this by putting the data in the format ggplot likes. In this case, a column that can be used to split the data into facets (called var below). To do that, I just repeated the data three times, choosing the appropriate x and y variables for each 2-way combo, and using the variable left out of each combination as the coloring variable.

## Rearrange the data by 2-way combinations, the coloring is the remaining column
res <- do.call(rbind, combn(1:3, 2, function(ii)
    cbind(setNames(dat[,c(ii, setdiff(1:3, ii))], c("x", "y", "color")),
                   var=paste(ii, collapse=".")), simplify=F))

ggplot(res, aes(x=x, y=y, color=color))+ geom_point(alpha = .2,size = 3) + 
  facet_wrap(~ var, scales="free") + sc

edited Jul 31, 2015 at 0:31

answered Jul 31, 2015 at 0:11

Rorschach

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3 Comments

Lucien S. Over a year ago

Fantastic! is it possible to give each of these facet a separate color legend?

Rorschach Over a year ago

@Rodolphe I'm not sure, I was just trying to make sense of the colors, will update if I figure anything out. What you can do easily is put three plots (not facetted) on the same canvas with different legends, but that totally defeats the purpose of this.

Rorschach Over a year ago

@Rodolphe this answer here from hadley, stackoverflow.com/a/3809071/2415684, makes me think a hack might be necessary... Maybe color by distance from each variables mean (by scaleing)? I dont know sry

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