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+##task 1: convert iris.csv to iris.txt
+##Before running the code below, please make sure that iris.csv is in your working directory
+iris_data <- read.csv('iris.csv',sep=',')#read in iris.csv
+write.table(iris_data, file = 'iris.txt',sep = "\t")#write the data to iris.txt and use tab as delimiter
+
+##task 2: create a list of length 5
+a <- seq(from=100, to=1000, by=100)#generate a vector containing 100, 200, ..., 1000
+b <- data.frame(team_name=c("Notre Dame","UNLV"),score=c(44,21))
+c <- 999
+d <- 1:50#generate a vector containing 1 to 50
+dim(d) <- c(10, 5)#convert vector d to a matrix
+e <- c("a","b","c")
+
+#generate a null list and then assign the variables above to the list
+mylist <- NULL
+mylist[[1]] <- a
+mylist[[2]] <- b
+mylist[[3]] <- c
+mylist[[4]] <- d
+mylist[[5]] <- e
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