# PlotVenn

##### Plot a Venn Diagram

This function produces Venn diagrams for up to 5 datasets.

- Keywords
- hplot

##### Usage

`PlotVenn(x, col = "transparent", plotit = TRUE, labels = NULL)`

##### Arguments

- x
the list with the sets to be analysed. Those can be factors or something coercable to a factor.

- col
the colors for the sets on the plot.

- plotit
logical. Should a plot be produced or just the results be calculated.

- labels
special labels for the plot. By default the names of the list x will be used. If those are missing, the LETTERS A..E will be chosen. Set this argument to NA, if no labels at all should be plotted.

##### Details

The function calculates the necessary frequencies and plots the venn diagram.

##### Value

a list with 2 elements, the first contains a table with the observed frequencies in the given sets. The second returns a data.frame with the xy coordinates for the labels in the venn diagram, the specific combination of factors and the frequency in that intersection area. The latter can be 0 as well.

##### References

Venn, J. (1880): On the Diagrammatic and Mechanical Representation of Propositions and Reasonings.
*Dublin Philosophical Magazine and Journal of Science* 9 (59): 1-18.

Edwards, A.W.F. (2004): Cogwheels of the mind: the story of Venn diagrams. *JHU Press* ISBN 978-0-8018-7434-5.

##### Examples

```
# NOT RUN {
element <- function() paste(sample(LETTERS, 5, replace=TRUE), collapse="")
group <- replicate(1000, element())
GroupA <- sample(group, 400, replace=FALSE)
GroupB <- sample(group, 750, replace=FALSE)
GroupC <- sample(group, 250, replace=FALSE)
GroupD <- sample(group, 300, replace=FALSE)
x <- list(GroupA, GroupB, GroupC, GroupD)
x
PlotVenn(x=list(GroupA, GroupB))
PlotVenn(x=list(Set_1=GroupA, Set_2=GroupB))
PlotVenn(x=list(GroupA, GroupB), labels=c("English","Spanish"))
PlotVenn(x=x[1:3])
PlotVenn(x=x[1:4], col=SetAlpha(c("blue","red","yellow","green","lightblue"), 0.2))
r.venn <- PlotVenn(x=x[1:5], col=SetAlpha(c("blue","red","yellow","green","lightblue"), 0.2))
r.venn
# }
```

*Documentation reproduced from package DescTools, version 0.99.36, License: GPL (>= 2)*