Slide 47
Slide 47 text
Indexing
names(CO2)
CO2$Treatment
CO2[,3]
CO2[3,]
CO2[1:6,]
CO2[c(1,2,3,4,5,6),3]
CO2$Treatment[1:6]
CO2[CO2$conc>100,]
CO2[CO2$Treatment=="chilled",]
CO2[sample(nrow(CO2), 10),]
available names
"Treatment" column
all rows, column 3
row 3, all columns
rows 1-6, all columns
rows 1-6, column 3
elements 1-6 of Treatment
rows where conc > 100
rows where Treatment == “chilled"
10 random rows