Data sorting

In R, we have several ways to sort data. The easiest way is to use the sort() function (see the code for the simplest one-dimensional data):

> set.seed(123) 
> x<-rnorm(100) 
> head(x) 
[1] -0.56047565 -0.23017749  1.55870831  0.07050839  0.12928774  1.71506499 
> y<-sort(x) 
> head(y) 
[1] -2.309169 -1.966617 -1.686693 -1.548753 -1.265396 -1.265061 

Let's look at another way to sort data. The dataset used is called nyseListing, which is included in the R package called fImport, shown here:

library(fImport) 
data(nyseListing) 
dim(nyseListing) 
head(nyseListing) 

The output is shown here:

In total, we have 3,387 observations, each with 4 variables. The dataset is sorted by Symbol, as in the tickers of individual stocks. Assume that we want to sort them by Name, as shown here:

> x<-nyseListing[order(nyseListing$Name),] 
> head(x...