## Line Plots

A line plot is a graph displaying a relation between x and y as a line in a Cartesian coordinate system. The relation may correspond to an abstract mathematical function or to relation present between two variables in a specific dataset:

# Using the curve function
sinc = function(x) {
return(sin(pi * x) / (pi * x))
}
curve(sinc, -7, +7, main = "Using curve")
# Using plot
s = sort.int(mpg$cty, index.return = T) # S$x holds the sorted values of city mpg
# S$ix holds the indices of the sorted values of city mpg # First plot the sorted city mpg values with a line plot plot(s$x,
main = "Using plot",
type = "l",
lty = 2,
xlab = "sample number (sorted by city mpg)",
ylab = "mpg")
lines(mpg$hwy[S$ix] ,lty = 1) # add dashed line of hwy mpg
legend("topleft", c("highway mpg", "city mpg"), lty = c(1, 2))
# Using qplot
x = seq(-2, 2, length.out = 30)
y = x ^ 2
qplot(x, y, geom = "line", main = "Using qplot")
qplot(x, y, geom = c("point", "line")) # multiple geometries can be present
# Using ggplot
x = seq(-2, 2, length.out = 30)
y = x ^ 2
dataframe = data.frame(x = x, y = y)
ggplot(dataframe, aes(x = x, y = y)) + geom_line() + geom_point() +
ggtitle("Using ggplot")
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