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Some examples are shown below. 30 Histogram of compMix −4 −2 0 2 4 compMix Figure 17: Histograms of two-component mixture model generated from Normal distributions. The density is overlayed in red. 023886 # quantile c CSIRO Australia, 2005 Course Materials and Exercises R Objects 45 R Objects Data Objects in R The four most frequently used types of data objects in R are vectors, matrices, data frames and lists. A vector represents a set of elements of the same mode whether they are logical, numeric (integer or double), complex, character or lists.

5 6 7 Sepal W. 5 1 2 3 4 Petal L. Petal W. 5 1 2 3 4 5 6 7 Figure 18: Pairwise plot of the iris data frame Accessing Elements of a Vector or Matrix Accessing elements is achieved through a process called indexing. Indexing may be done by • a vector of positive integers: to indicate inclusion c CSIRO Australia, 2005 Course Materials and Exercises R Objects 54 • a vector of negative integers: to indicate exclusion • a vector of logical values: to indicate which are in and which are out • a vector of names: if the object has a names attribute For the latter, if a zero index occurs on the right, no element is selected.

Figure 19 displays the density plot produced from the script below. 5, xlab="Weight",ylab="Density") > lines(dw5,lty=1,col="blue") > lines(dw10,lty=2,col="red") > pu <- par("usr")[3:4] # actual y limits > segments(Weight,pu[1],Weight,0,col="green") > legend(locator(1),c("500kg window", "1000kg window"),lty=1:2) 6 e−04 > detach("Cars93") Density 0 e+00 1 e−04 2 e−04 3 e−04 4 e−04 5 e−04 500kg window 1000kg window 1000 2000 3000 4000 5000 Weight Figure 19: Density plot of vehicle weight from the Cars93 dataset.

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An Introduction to R Software for Statistical Modelling & Computing by Kuhnert&Venable


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