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I am trying to add a simple legend to a customized pairs graph.
Here is the reproductible code (without my customized pairs function) :
layout(cbind(1,2),width=c(1,1))
layout.show(2)
pairs(USJudgeRatings)
Why is the pairs function "erasing" my layout information ?
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The pairs function is provided in R Language by default and it produces a matrix of scatterplots. The pairs() function takes the data frame as an argument and returns a matrix of scatter plots between each pair of variables in the data frame. Parameter: df: determines the data frame used for plotting to scatter plot.
A pairs plot is a matrix of scatterplots that lets you understand the pairwise relationship between different variables in a dataset. Fortunately it's easy to create a pairs plot in R by using the pairs() function. This tutorial provides several examples of how to use this function in practice.
A warning contained in the help for layout is
These functions are totally incompatible with the other mechanisms for arranging plots on a device: par(mfrow), par(mfcol)
Unfortunately, pairs uses mfrow for arranging the plots.
Using the hints from Duncan Murdoch and Uwe Ligges on R help, you can set oma to a reasonable value to give you room for a legend on the side, eg
pairs(iris[1:4], main = "Anderson's Iris Data -- 3 species",
pch = 21, bg = c("red", "green3", "blue")[iris$Species],
oma=c(4,4,6,12))
# allow plotting of the legend outside the figure region
# (ie within the space left by making the margins big)
par(xpd=TRUE)
legend(0.85, 0.7, as.vector(unique(iris$Species)),
fill=c("red", "green3", "blue"))
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