Image scatter plot matrix

Image scatter plot matrix

The ipairs function produces an image scatter plot matrix of large datasets where the colors encode the density of the points in the scatter plots.

In this example, correlations of Ox concentrations between three different sites (Altdorf, Lucerne and Schwyz) are demonstrated.

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R Code

## load required packages

library(IDPmisc)
library(SwissAir) # data for the example

## prepare the data

Ox <- AirQual[,c("ad.O3","lu.O3","sz.O3")] +
  AirQual[,c("ad.NOx","lu.NOx","sz.NOx")] -
  AirQual[,c("ad.NO","lu.NO","sz.NO")]
names(Ox) <- c("ad","lu","sz")

## draw graph

ipairs(Ox, ztransf = function(x){x[x<1] <- 1; log2(x)})