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Exercise 1

Consider 3 vectors, day, month and year:

```year=c(2005:2016) month=c(1:12) day=c(1:31) ```

Define a list Date such as:
``` Date=```

\$year
 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

\$month
 1 2 3 4 5 6 7 8 9 10 11 12

\$day
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Exercise 2

write an R statement that will replace the values of year element in Date list for `c(2000:2010)`.

Exercise 3

write an R statement that will delete the value 4 of the month component of the list Date.

Exercise 4

Consider a vector x such that:
`x=c(1,3,4,7,11,18,29)`
Write an R statement that will return a list X2 with components of value:
`x*2,x/2,sqrt(x)` and names `"x*2","x/2","sqrt(x)"`

Exercise 5

Consider the X2 list.
Write an R statement that will return a vector:
`2.000000 2.645751 3.316625`

Exercise 6

Write an R statement that will return a concatenation M, of Date and X2 lists.
``` M \$year  2000 2001 2002 2003 2004 2005 2006 2007 2008```

\$month
 1 2 3 5 6 7 8 9 10 11 12

\$day
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 24 25 26 27 28 29 30 31

\$`x*2`
 2 6 8 14 22 36 58

\$`x/2`
 0.5 1.5 2.0 3.5 5.5 9.0 14.5

\$`sqrt(x)`
 1.000000 1.732051 2.000000 2.645751 3.316625 4.242641 5.385165

Exercise 7

Write an R statement that will return a sublist N of M, with components year,x*2 and day.

Exercise 8

Consider the N list.
Write an R statement that will return:
-the length of x*2 vector in N
-the value of the second element of vector year in N

Exercise 9

Consider 3 letters vectors, and 2 numeric vectors:
`A=letters[1:4],B=letters[5:10],C=letters[11:15]`
`D=c(1:10),E=c(20:5)`

Define a list z, with elementes x and y,such that
x is a list with elements A,B,and C;
and y is alist with elements D and E.

Exercise 10
Write an R statement that will return:
-the number on third position on the second vector of the first list of z
-the letter on fifth position on the third vector of the second list of z

Want some extra practice with lists? Please take a look here