Data Presentation

Question 1

want to include variables from an R session in mathematical expressions, and substitute in their actual values

Answer 1

substitute()

Question 2

hist(rnorm(100, x_mean, x_sd),
  main = substitute(
    paste(X[i], " ~ N(", mu, "=", m, ", ", sigma^2, "=", s2, ")"),
    list(m = x_mean, s2 = x_sd^2)
  )
)

Answer 2

if we want to include variables from an R session in mathematical expressions, and substitute in their actual values, we can use substitute().

Question 3

a demo that shows you everything about plotting math in R (it was written by the R Core Team

Answer 3

demo(plotmath)

Question 4

Want to write mathematical symbols and expressions in R graphics?

Answer 4

expression()

Question 5

library(RColorBrewer)
par(mar = c(0, 4, 0, 0))
display.brewer.all()

Answer 5

the color palettes in RColorBrewer

Question 6

brewer.pal(8, “Set2”)

Answer 6

generate 8 colors from the Set2 palette