##### Lesson 5: Let us 'R'eview #####

# Setting the working directory 
setwd(“provide the path to your folder“)
list.files()

# reading the input files
nyctemperature = read.table("nyc_temperature.txt",header=TRUE)

# define sample space S as all data
S = nyctemperature

# define set A as the february days
A = which(S[,2]==2)

# define set B as the warm days
B = which(S[,7]>=50)

# intersection of A and B
C = intersect(A,B)

# define set D as the cold days
D = which(S[,7]<=25)

# define set E as Saturdays
E = which(S[,4]=="Saturday")

# intersection of D and E
F = intersect(D,E)