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RinA CH03 Code.txt
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RinA CH03 Code.txt
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#-----------------------------------------------------#
# R in Action: Chapter 3 #
# requires that the Hmisc package has been installed #
# install.packages('Hmisc') #
#-----------------------------------------------------#
# pause after each graph
par(ask = TRUE)
# --Section 3.1--
attach(mtcars)
plot(wt, mpg)
abline(lm(mpg ~ wt))
title("Regression of MPG on Weight")
detach(mtcars)
# --Section 3.2--
dose <- c(20, 30, 40, 45, 60)
drugA <- c(16, 20, 27, 40, 60)
drugB <- c(15, 18, 25, 31, 40)
plot(dose, drugA, type = "b")
# --Section 3.3--
opar <- par(no.readonly = TRUE)
par(lty = 2, pch = 17)
plot(dose, drugA, type = "b")
par(opar)
plot(dose, drugA, type = "b", lty = 2, pch = 17)
plot(dose, drugA, type = "b", lyt = 3, lwd = 3, pch = 15,
cex = 2)
n <- 10
mycolors <- rainbow(n)
pie(rep(1, n), labels = mycolors, col = mycolors)
mygrays <- gray(0:n/n)
pie(rep(1, n), labels = mygrays, col = mygrays)
# Listing 3.1 - Using graphical parameters to control
# graph appearance
dose <- c(20, 30, 40, 45, 60)
drugA <- c(16, 20, 27, 40, 60)
drugB <- c(15, 18, 25, 31, 40)
opar <- par(no.readonly = TRUE)
par(pin = c(2, 3))
par(lwd = 2, cex = 1.5)
par(cex.axis = 0.75, font.axis = 3)
plot(dose, drugA, type = "b", pch = 19, lty = 2, col = "red")
plot(dose, drugB, type = "b", pch = 23, lty = 6, col = "blue",
bg = "green")
par(opar)
# --Section 3.4--
plot(dose, drugA, type = "b", col = "red", lty = 2,
pch = 2, lwd = 2, main = "Clinical Trials for Drug A",
sub = "This is hypothetical data",
xlab = "Dosage", ylab = "Drug Response", xlim = c(0, 60),
ylim = c(0, 70))
# Listing 3.2 - An Example of Custom Axes
x <- c(1:10)
y <- x
z <- 10/x
opar <- par(no.readonly = TRUE)
par(mar = c(5, 4, 4, 8) + 0.1)
plot(x, y, type = "b", pch = 21, col = "red", yaxt = "n",
lty = 3, ann = FALSE)
lines(x, z, type = "b", pch = 22, col = "blue", lty = 2)
axis(2, at = x, labels = x, col.axis = "red", las = 2)
axis(4, at = z, labels = round(z, digits = 2), col.axis = "blue",
las = 2, cex.axis = 0.7, tck = -0.01)
mtext("y=1/x", side = 4, line = 3, cex.lab = 1, las = 2,
col = "blue")
title("An Example of Creative Axes", xlab = "X values",
ylab = "Y=X")
par(opar)
# Listing 3.3 - Comparing Drug A and Drug B response by dose
dose <- c(20, 30, 40, 45, 60)
drugA <- c(16, 20, 27, 40, 60)
drugB <- c(15, 18, 25, 31, 40)
opar <- par(no.readonly = TRUE)
par(lwd = 2, cex = 1.5, font.lab = 2)
plot(dose, drugA, type = "b", pch = 15, lty = 1, col = "red",
ylim = c(0, 60), main = "Drug A vs. Drug B", xlab = "Drug Dosage",
ylab = "Drug Response")
lines(dose, drugB, type = "b", pch = 17, lty = 2,
col = "blue")
abline(h = c(30), lwd = 1.5, lty = 2, col = "grey")
library(Hmisc)
minor.tick(nx = 3, ny = 3, tick.ratio = 0.5)
legend("topleft", inset = 0.05, title = "Drug Type",
c("A", "B"), lty = c(1, 2), pch = c(15, 17), col = c("red",
"blue"))
par(opar)
# --Section 3.4.5--
# Example of labeling points
attach(mtcars)
plot(wt, mpg, main = "Milage vs. Car Weight", xlab = "Weight",
ylab = "Mileage", pch = 18, col = "blue")
text(wt, mpg, row.names(mtcars), cex = 0.6, pos = 4,
col = "red")
detach(mtcars)
# View font families
opar <- par(no.readonly = TRUE)
par(cex = 1.5)
plot(1:7, 1:7, type = "n")
text(3, 3, "Example of default text")
text(4, 4, family = "mono", "Example of mono-spaced text")
text(5, 5, family = "serif", "Example of serif text")
par(opar)
# --Section 3.5--
# combining graphs
# Figure 3.14
attach(mtcars)
opar <- par(no.readonly = TRUE)
par(mfrow = c(2, 2))
plot(wt, mpg, main = "Scatterplot of wt vs. mpg")
plot(wt, disp, main = "Scatterplot of wt vs disp")
hist(wt, main = "Histogram of wt")
boxplot(wt, main = "Boxplot of wt")
par(opar)
detach(mtcars)
# Figure 3.15
attach(mtcars)
opar <- par(no.readonly = TRUE)
par(mfrow = c(3, 1))
hist(wt)
hist(mpg)
hist(disp)
par(opar)
detach(mtcars)
# Figure 3.16
attach(mtcars)
layout(matrix(c(1, 1, 2, 3), 2, 2, byrow = TRUE))
hist(wt)
hist(mpg)
hist(disp)
detach(mtcars)
# Figure 3.17
attach(mtcars)
layout(matrix(c(1, 1, 2, 3), 2, 2, byrow = TRUE),
widths = c(3, 1), heights = c(1, 2))
hist(wt)
hist(mpg)
hist(disp)
detach(mtcars)
# Listing 3.4 - Fine placement of figures in a graph
opar <- par(no.readonly = TRUE)
par(fig = c(0, 0.8, 0, 0.8))
plot(mtcars$wt, mtcars$mpg, xlab = "Miles Per Gallon",
ylab = "Car Weight")
par(fig = c(0, 0.8, 0.55, 1), new = TRUE)
boxplot(mtcars$wt, horizontal = TRUE, axes = FALSE)
par(fig = c(0.65, 1, 0, 0.8), new = TRUE)
boxplot(mtcars$mpg, axes = FALSE)
mtext("Enhanced Scatterplot", side = 3, outer = TRUE,
line = -3)
par(opar)