execerise on vectors and matrices

create a vector, “ret” and asign 10 return values (see section 2.3)

ret <- c(1, 2, 3, 4, 5)
years <- c("2001", "2002", "2003", "2004", "2005")

names(ret) <- years 

ret
## 2001 2002 2003 2004 2005 
##    1    2    3    4    5

return <- c(1, 2, 3)
days <- c("monday","tuesday", "wednesday")
names(return) <- days

return 
##    monday   tuesday wednesday 
##         1         2         3

plot(return, type ="l")

return[1:2]
##  monday tuesday 
##       1       2

return [c("tuesday","wednesday")]
##   tuesday wednesday 
##         2         3