2.4 Executing Code
REVIEW To send R commands to the R Console we can use
the appropriate toolbar buttons. One line or a highlighted region can
be sent using the
Run button. Having opened a new R
script file we can enter the commands below. The four commands make up
a program which begins with an
install.packages() to ensure
we have installed two requisite software packages for R. The second
and third commands use
library() to load those
packages into the current R session. The fourth command produces a
plot of the weatherAUS dataset. This
dataset contains daily observations of weather related variables
across some 50 weather stations in Australia over multiple years.
install.packages(c("ggplot2", "rattle")) library(ggplot2) library(rattle) qplot(data=weatherAUS, x=MinTemp, y=MaxTemp)
qplot() allows us to quickly code a
plot. Using the weatherAUS dataset we plot
the minimum daily temperature (
MinTemp) on the x-axis
against the maximum daily temperature (
MaxTemp) on the
y-axis. The resulting plot is a scatter plot as
we see the plot in the lower right pane.
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