# Subset Example -- subset.r source code.

# Load ExamSco data into R.
all = read.table("examsco2.txt", header=TRUE)

# Print data frame.
cat("all data frame:\n")
print(all)

# Make variables in all available to session so that
# all$ prefix is not needed
attach(all)

# Select only rows where gender="F" and columns
# name, midterm, and final.
women = all[gender == "F", c("name", "midterm", "final")]

# Print subsetted data frame.
cat("women data frame:")
print(women)