Venn Diagrams with R?

Answer 1

Duncan Murdoch has a venn package, which is not on CRAN. (hat tip to Gabor Grothendieck)

You can also read about it in the "Journal of Statistical Software".

Answer 2

The venn function in the gplots package is also useful if you need to create Venn Diagram of 4/5 sets.

Answer 3

I use two custom functions that to the trick. My implementation of venndia plots the venn diagram and returns lists of overlaps between A and B (and C). See the code below.

With these, you can

vd <- venndia(A=LETTERS[1:15], B=LETTERS[5:20], getdata=TRUE)

which will both plot and return the data. you can switch off returning the data by doing

venndia(A=LETTERS[1:15], B=LETTERS[5:20])

since getdata is FALSE by default. /Daniel

circle <- function(x, y, r, ...) {
    ang <- seq(0, 2*pi, length = 100)
    xx <- x + r * cos(ang)
    yy <- y + r * sin(ang)
    polygon(xx, yy, ...)
}

venndia <- function(A, B, C, getdata=FALSE, ...){
    cMissing <- missing(C)
    if(cMissing){ C <- c() }

    unionAB <- union(A, B)
    unionAC <- union(A, C)
    unionBC <- union(B, C)
    uniqueA <- setdiff(A, unionBC)
    uniqueB <- setdiff(B, unionAC)
    uniqueC <- setdiff(C, unionAB)
    intersAB <- setdiff(intersect(A, B), C)
    intersAC <- setdiff(intersect(A, C), B)
    intersBC <- setdiff(intersect(B, C), A)
    intersABC <- intersect(intersect(A, B), intersect(B, C))

    nA <- length(uniqueA) 
    nB <- length(uniqueB)
    nC <- length(uniqueC)

    nAB <- length(intersAB)
    nAC <- length(intersAC)
    nBC <- length(intersBC)

    nABC <- length(intersABC) 

    par(mar=c(2, 2, 0, 0))
    plot(-10, -10, ylim=c(0, 9), xlim=c(0, 9), axes=FALSE, ...)
    circle(x=3, y=6, r=3, col=rgb(1,0,0,.5), border=NA)
    circle(x=6, y=6, r=3, col=rgb(0,.5,.1,.5), border=NA)
    circle(x=4.5, y=3, r=3, col=rgb(0,0,1,.5), border=NA)

    text( x=c(1.2, 7.7, 4.5), y=c(7.8, 7.8, 0.8), c("A", "B", "C"), cex=3, col="gray90" )

    text(
     x=c(2, 7, 4.5, 4.5, 3, 6, 4.5), 
     y=c(7, 7, 2  , 7  , 4, 4, 5), 
     c(nA, nB, nC, nAB, nAC, nBC, nABC), 
     cex=2
    )

    if(getdata){
     list(A=uniqueA, B=uniqueB, C=uniqueC, 
      AB=intersAB , AC=intersAC , BC=intersBC , 
      ABC=intersABC
     )
    }
}