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# Help page, example, demo
?plot # initiate the help page
example(plot) # run examples at the example section
demo() # list all demos availabe by package
demo(persp) # demo for one function
# Math typing
aa <- 1000
windows(width = 5.5, height = 3, pointsize = 10, family = "serif")
par(mai = c(0.4, 0.4, 0.1, 0.1))
plot(1:5, type = "n") # an empty plot generated
text(x = 2, y = 4, labels =
expression(paste("This is ", alpha %*% beta, ".", sep = "")))
text(x = 2, y = 3, labels = expression(delta == aa)) # bad on aa
text(x = 2, y = 2, labels = bquote(expr = delta == .(aa))) # good
text(x = 4, y = 3, labels = substitute(expr = aa)) # good for "aa" symbol
text(x = 4, y = 2, labels = aa) # good for the value of "aa"
myplot <- recordPlot()
pdf(file = "c:/aErer/fig_math.pdf", width = 6, height = 3, pointsize = 10,
family = "serif")
replayPlot(myplot); dev.off()
# Interactive functions
windows(); plot(1:10); locator(n = 3); identify(x = 3, y = 3)
# Build a graph with low-level functions
set.seed(12); dat <- rnorm(30)
windows()
plot(dat, type = 'n', axes = FALSE, ann = FALSE) # an empty plot
box(); axis(side = 1); axis(side = 2); points(x = dat)
title(main = "Random numbers from the normal distribution")
title(xlab = "x", ylab = "y")
legend(x = 5, y = 2, legend = "random numbers", pch = 1)
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