In this recipe, you will learn the simplest way to change the colors of points, lines, and bars in scatter plots, line plots, histograms, and bar plots.
All you need to try out in this recipe is to run R and type the recipe in the command prompt. You can also choose to save the recipe as a script so that you can use it again later on.
The simplest way to change the color of any graph element is using the
col argument. For example, the plot() function takes the col argument:
plot(rnorm(1000), col="red")
If we choose the plot type as the line, then the color is applied to the plotted line. Let's use the dailysales.csv example dataset we used in Chapter 1, R Graphics. First, we need to load it:
Sales <- read.csv("dailysales.csv",header=TRUE)
plot(sales$units~as.Date(sales$date,"%d/%m/%y"),
type="l", #Specify type of plot as l for line
col="blue")
Similarly, the points() and lines() functions apply the col argument's value...